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Finding the Fourth Proportional to 1,247.38, 1,871.31 and 381.82

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Solution

The fourth proportional to 1,247.38, 1,871.31 and 381.82 is: 572.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.38 : 1,871.31 = 381.82 : x
  2. Step 2: Convert to fraction form
    1,247.38/1,871.31 = 381.82/x
  3. Step 3: Cross multiply
    1,247.38x = 1,871.31 × 381.82
  4. Step 4: Simplify right side
    1,247.38x = 714,503.58
  5. Step 5: Solve for x
    x = 714,503.58/1,247.38
  6. Step 6: Final answer
    x = 572.80

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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.