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Finding the Fourth Proportional to 1,332.52, 1,997.28 and 638.20

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Solution

The fourth proportional to 1,332.52, 1,997.28 and 638.20 is: 956.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.52 : 1,997.28 = 638.20 : x
  2. Step 2: Convert to fraction form
    1,332.52/1,997.28 = 638.20/x
  3. Step 3: Cross multiply
    1,332.52x = 1,997.28 × 638.20
  4. Step 4: Simplify right side
    1,332.52x = 1,274,664.10
  5. Step 5: Solve for x
    x = 1,274,664.10/1,332.52
  6. Step 6: Final answer
    x = 956.58

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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.