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Finding the Fourth Proportional to 691.44, 1,036.92 and 433.28

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Solution

The fourth proportional to 691.44, 1,036.92 and 433.28 is: 649.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.44 : 1,036.92 = 433.28 : x
  2. Step 2: Convert to fraction form
    691.44/1,036.92 = 433.28/x
  3. Step 3: Cross multiply
    691.44x = 1,036.92 × 433.28
  4. Step 4: Simplify right side
    691.44x = 449,276.70
  5. Step 5: Solve for x
    x = 449,276.70/691.44
  6. Step 6: Final answer
    x = 649.77

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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.