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Finding the Fourth Proportional to 691.28, 1,034.16 and 474.20

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Solution

The fourth proportional to 691.28, 1,034.16 and 474.20 is: 709.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.28 : 1,034.16 = 474.20 : x
  2. Step 2: Convert to fraction form
    691.28/1,034.16 = 474.20/x
  3. Step 3: Cross multiply
    691.28x = 1,034.16 × 474.20
  4. Step 4: Simplify right side
    691.28x = 490,398.67
  5. Step 5: Solve for x
    x = 490,398.67/691.28
  6. Step 6: Final answer
    x = 709.41

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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.