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Finding the Fourth Proportional to 1,387.88, 2,081.82 and 361.88

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Solution

The fourth proportional to 1,387.88, 2,081.82 and 361.88 is: 542.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.88 : 2,081.82 = 361.88 : x
  2. Step 2: Convert to fraction form
    1,387.88/2,081.82 = 361.88/x
  3. Step 3: Cross multiply
    1,387.88x = 2,081.82 × 361.88
  4. Step 4: Simplify right side
    1,387.88x = 753,358.61
  5. Step 5: Solve for x
    x = 753,358.61/1,387.88
  6. Step 6: Final answer
    x = 542.81

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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.