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Finding the Fourth Proportional to 932.16, 1,397.68 and 643.28

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Solution

The fourth proportional to 932.16, 1,397.68 and 643.28 is: 964.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.16 : 1,397.68 = 643.28 : x
  2. Step 2: Convert to fraction form
    932.16/1,397.68 = 643.28/x
  3. Step 3: Cross multiply
    932.16x = 1,397.68 × 643.28
  4. Step 4: Simplify right side
    932.16x = 899,099.59
  5. Step 5: Solve for x
    x = 899,099.59/932.16
  6. Step 6: Final answer
    x = 964.53

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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.