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Finding the Fourth Proportional to 478.38, 716.19 and 440.11

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Solution

The fourth proportional to 478.38, 716.19 and 440.11 is: 658.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.38 : 716.19 = 440.11 : x
  2. Step 2: Convert to fraction form
    478.38/716.19 = 440.11/x
  3. Step 3: Cross multiply
    478.38x = 716.19 × 440.11
  4. Step 4: Simplify right side
    478.38x = 315,202.09
  5. Step 5: Solve for x
    x = 315,202.09/478.38
  6. Step 6: Final answer
    x = 658.89

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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.