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Finding the Fourth Proportional to 2,487.74, 3,731.71 and 821.91

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Solution

The fourth proportional to 2,487.74, 3,731.71 and 821.91 is: 1,232.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,487.74 : 3,731.71 = 821.91 : x
  2. Step 2: Convert to fraction form
    2,487.74/3,731.71 = 821.91/x
  3. Step 3: Cross multiply
    2,487.74x = 3,731.71 × 821.91
  4. Step 4: Simplify right side
    2,487.74x = 3,067,125.66
  5. Step 5: Solve for x
    x = 3,067,125.66/2,487.74
  6. Step 6: Final answer
    x = 1,232.90

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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.