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Finding the Fourth Proportional to 871.65, 1,306.53 and 432.29

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Solution

The fourth proportional to 871.65, 1,306.53 and 432.29 is: 647.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.65 : 1,306.53 = 432.29 : x
  2. Step 2: Convert to fraction form
    871.65/1,306.53 = 432.29/x
  3. Step 3: Cross multiply
    871.65x = 1,306.53 × 432.29
  4. Step 4: Simplify right side
    871.65x = 564,803.12
  5. Step 5: Solve for x
    x = 564,803.12/871.65
  6. Step 6: Final answer
    x = 647.97

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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.