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Finding the Fourth Proportional to 872.72, 1,309.08 and 487.76

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Solution

The fourth proportional to 872.72, 1,309.08 and 487.76 is: 731.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.72 : 1,309.08 = 487.76 : x
  2. Step 2: Convert to fraction form
    872.72/1,309.08 = 487.76/x
  3. Step 3: Cross multiply
    872.72x = 1,309.08 × 487.76
  4. Step 4: Simplify right side
    872.72x = 638,516.86
  5. Step 5: Solve for x
    x = 638,516.86/872.72
  6. Step 6: Final answer
    x = 731.64

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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.