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Finding the Fourth Proportional to 871.92, 1,307.61 and 432.72

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Solution

The fourth proportional to 871.92, 1,307.61 and 432.72 is: 648.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.92 : 1,307.61 = 432.72 : x
  2. Step 2: Convert to fraction form
    871.92/1,307.61 = 432.72/x
  3. Step 3: Cross multiply
    871.92x = 1,307.61 × 432.72
  4. Step 4: Simplify right side
    871.92x = 565,829.00
  5. Step 5: Solve for x
    x = 565,829.00/871.92
  6. Step 6: Final answer
    x = 648.95

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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.