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Finding the Fourth Proportional to 717,209.43, 989,729.14 and 390,528.12

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Solution

The fourth proportional to 717,209.43, 989,729.14 and 390,528.12 is: 538,917.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,209.43 : 989,729.14 = 390,528.12 : x
  2. Step 2: Convert to fraction form
    717,209.43/989,729.14 = 390,528.12/x
  3. Step 3: Cross multiply
    717,209.43x = 989,729.14 × 390,528.12
  4. Step 4: Simplify right side
    717,209.43x = 386,517,060,353.42
  5. Step 5: Solve for x
    x = 386,517,060,353.42/717,209.43
  6. Step 6: Final answer
    x = 538,917.98

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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.