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Finding the Fourth Proportional to 712,541.90, 983,270.98 and 390,189.80

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Solution

The fourth proportional to 712,541.90, 983,270.98 and 390,189.80 is: 538,441.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,541.90 : 983,270.98 = 390,189.80 : x
  2. Step 2: Convert to fraction form
    712,541.90/983,270.98 = 390,189.80/x
  3. Step 3: Cross multiply
    712,541.90x = 983,270.98 × 390,189.80
  4. Step 4: Simplify right side
    712,541.90x = 383,662,307,032.00
  5. Step 5: Solve for x
    x = 383,662,307,032.00/712,541.90
  6. Step 6: Final answer
    x = 538,441.75

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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.