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Finding the Fourth Proportional to 472.38, 707.76 and 255.57

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Solution

The fourth proportional to 472.38, 707.76 and 255.57 is: 382.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.38 : 707.76 = 255.57 : x
  2. Step 2: Convert to fraction form
    472.38/707.76 = 255.57/x
  3. Step 3: Cross multiply
    472.38x = 707.76 × 255.57
  4. Step 4: Simplify right side
    472.38x = 180,882.22
  5. Step 5: Solve for x
    x = 180,882.22/472.38
  6. Step 6: Final answer
    x = 382.92

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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.