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Finding the Fourth Proportional to 1,452.38, 2,178.84 and 478.55

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Solution

The fourth proportional to 1,452.38, 2,178.84 and 478.55 is: 717.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,452.38 : 2,178.84 = 478.55 : x
  2. Step 2: Convert to fraction form
    1,452.38/2,178.84 = 478.55/x
  3. Step 3: Cross multiply
    1,452.38x = 2,178.84 × 478.55
  4. Step 4: Simplify right side
    1,452.38x = 1,042,683.88
  5. Step 5: Solve for x
    x = 1,042,683.88/1,452.38
  6. Step 6: Final answer
    x = 717.91

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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.