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Finding the Fourth Proportional to 871.20, 1,305.77 and 432.18

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Solution

The fourth proportional to 871.20, 1,305.77 and 432.18 is: 647.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.20 : 1,305.77 = 432.18 : x
  2. Step 2: Convert to fraction form
    871.20/1,305.77 = 432.18/x
  3. Step 3: Cross multiply
    871.20x = 1,305.77 × 432.18
  4. Step 4: Simplify right side
    871.20x = 564,325.52
  5. Step 5: Solve for x
    x = 564,325.52/871.20
  6. Step 6: Final answer
    x = 647.76

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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.