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Finding the Fourth Proportional to 871.20, 1,306.32 and 432.51

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Solution

The fourth proportional to 871.20, 1,306.32 and 432.51 is: 648.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.20 : 1,306.32 = 432.51 : x
  2. Step 2: Convert to fraction form
    871.20/1,306.32 = 432.51/x
  3. Step 3: Cross multiply
    871.20x = 1,306.32 × 432.51
  4. Step 4: Simplify right side
    871.20x = 564,996.46
  5. Step 5: Solve for x
    x = 564,996.46/871.20
  6. Step 6: Final answer
    x = 648.53

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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.