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Finding the Fourth Proportional to 843.32, 1,265.76 and 432.74

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Solution

The fourth proportional to 843.32, 1,265.76 and 432.74 is: 649.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.32 : 1,265.76 = 432.74 : x
  2. Step 2: Convert to fraction form
    843.32/1,265.76 = 432.74/x
  3. Step 3: Cross multiply
    843.32x = 1,265.76 × 432.74
  4. Step 4: Simplify right side
    843.32x = 547,748.15
  5. Step 5: Solve for x
    x = 547,748.15/843.32
  6. Step 6: Final answer
    x = 649.51

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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.