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Finding the Fourth Proportional to 891.38, 1,337.08 and 480.72

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Solution

The fourth proportional to 891.38, 1,337.08 and 480.72 is: 721.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.38 : 1,337.08 = 480.72 : x
  2. Step 2: Convert to fraction form
    891.38/1,337.08 = 480.72/x
  3. Step 3: Cross multiply
    891.38x = 1,337.08 × 480.72
  4. Step 4: Simplify right side
    891.38x = 642,761.10
  5. Step 5: Solve for x
    x = 642,761.10/891.38
  6. Step 6: Final answer
    x = 721.09

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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.