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Finding the Fourth Proportional to 661,691.04, 991,756.32 and 319,921.20

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Solution

The fourth proportional to 661,691.04, 991,756.32 and 319,921.20 is: 479,504.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,691.04 : 991,756.32 = 319,921.20 : x
  2. Step 2: Convert to fraction form
    661,691.04/991,756.32 = 319,921.20/x
  3. Step 3: Cross multiply
    661,691.04x = 991,756.32 × 319,921.20
  4. Step 4: Simplify right side
    661,691.04x = 317,283,872,001.98
  5. Step 5: Solve for x
    x = 317,283,872,001.98/661,691.04
  6. Step 6: Final answer
    x = 479,504.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.