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Finding the Fourth Proportional to 712,581.48, 983,362.90 and 390,291.48

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Solution

The fourth proportional to 712,581.48, 983,362.90 and 390,291.48 is: 538,602.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,581.48 : 983,362.90 = 390,291.48 : x
  2. Step 2: Convert to fraction form
    712,581.48/983,362.90 = 390,291.48/x
  3. Step 3: Cross multiply
    712,581.48x = 983,362.90 × 390,291.48
  4. Step 4: Simplify right side
    712,581.48x = 383,798,161,618.09
  5. Step 5: Solve for x
    x = 383,798,161,618.09/712,581.48
  6. Step 6: Final answer
    x = 538,602.49

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.