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Finding the Fourth Proportional to 892.60, 1,338.66 and 747.28

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Solution

The fourth proportional to 892.60, 1,338.66 and 747.28 is: 1,120.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.60 : 1,338.66 = 747.28 : x
  2. Step 2: Convert to fraction form
    892.60/1,338.66 = 747.28/x
  3. Step 3: Cross multiply
    892.60x = 1,338.66 × 747.28
  4. Step 4: Simplify right side
    892.60x = 1,000,353.84
  5. Step 5: Solve for x
    x = 1,000,353.84/892.60
  6. Step 6: Final answer
    x = 1,120.72

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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.