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Finding the Fourth Proportional to 712,796.97, 983,659.77 and 390,518.49

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Solution

The fourth proportional to 712,796.97, 983,659.77 and 390,518.49 is: 538,915.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,796.97 : 983,659.77 = 390,518.49 : x
  2. Step 2: Convert to fraction form
    712,796.97/983,659.77 = 390,518.49/x
  3. Step 3: Cross multiply
    712,796.97x = 983,659.77 × 390,518.49
  4. Step 4: Simplify right side
    712,796.97x = 384,137,328,054.15
  5. Step 5: Solve for x
    x = 384,137,328,054.15/712,796.97
  6. Step 6: Final answer
    x = 538,915.49

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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.