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Finding the Fourth Proportional to 712,691.69, 983,517.35 and 390,404.03

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Solution

The fourth proportional to 712,691.69, 983,517.35 and 390,404.03 is: 538,759.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,691.69 : 983,517.35 = 390,404.03 : x
  2. Step 2: Convert to fraction form
    712,691.69/983,517.35 = 390,404.03/x
  3. Step 3: Cross multiply
    712,691.69x = 983,517.35 × 390,404.03
  4. Step 4: Simplify right side
    712,691.69x = 383,969,130,145.31
  5. Step 5: Solve for x
    x = 383,969,130,145.31/712,691.69
  6. Step 6: Final answer
    x = 538,759.10

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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.