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Finding the Fourth Proportional to 920.11, 1,380.70 and 487.27

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Solution

The fourth proportional to 920.11, 1,380.70 and 487.27 is: 731.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.11 : 1,380.70 = 487.27 : x
  2. Step 2: Convert to fraction form
    920.11/1,380.70 = 487.27/x
  3. Step 3: Cross multiply
    920.11x = 1,380.70 × 487.27
  4. Step 4: Simplify right side
    920.11x = 672,765.52
  5. Step 5: Solve for x
    x = 672,765.52/920.11
  6. Step 6: Final answer
    x = 731.18

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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.