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Finding the Fourth Proportional to 801.27, 1,105.65 and 477.90

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Solution

The fourth proportional to 801.27, 1,105.65 and 477.90 is: 659.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.27 : 1,105.65 = 477.90 : x
  2. Step 2: Convert to fraction form
    801.27/1,105.65 = 477.90/x
  3. Step 3: Cross multiply
    801.27x = 1,105.65 × 477.90
  4. Step 4: Simplify right side
    801.27x = 528,390.14
  5. Step 5: Solve for x
    x = 528,390.14/801.27
  6. Step 6: Final answer
    x = 659.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.