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Finding the Fourth Proportional to 1,247.52, 1,871.21 and 381.83

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Solution

The fourth proportional to 1,247.52, 1,871.21 and 381.83 is: 572.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.52 : 1,871.21 = 381.83 : x
  2. Step 2: Convert to fraction form
    1,247.52/1,871.21 = 381.83/x
  3. Step 3: Cross multiply
    1,247.52x = 1,871.21 × 381.83
  4. Step 4: Simplify right side
    1,247.52x = 714,484.11
  5. Step 5: Solve for x
    x = 714,484.11/1,247.52
  6. Step 6: Final answer
    x = 572.72

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.