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Finding the Fourth Proportional to 843.12, 1,264.80 and 432.72

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Solution

The fourth proportional to 843.12, 1,264.80 and 432.72 is: 649.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.12 : 1,264.80 = 432.72 : x
  2. Step 2: Convert to fraction form
    843.12/1,264.80 = 432.72/x
  3. Step 3: Cross multiply
    843.12x = 1,264.80 × 432.72
  4. Step 4: Simplify right side
    843.12x = 547,304.26
  5. Step 5: Solve for x
    x = 547,304.26/843.12
  6. Step 6: Final answer
    x = 649.14

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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.