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Finding the Fourth Proportional to 1,387.55, 2,081.19 and 361.55

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Solution

The fourth proportional to 1,387.55, 2,081.19 and 361.55 is: 542.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.55 : 2,081.19 = 361.55 : x
  2. Step 2: Convert to fraction form
    1,387.55/2,081.19 = 361.55/x
  3. Step 3: Cross multiply
    1,387.55x = 2,081.19 × 361.55
  4. Step 4: Simplify right side
    1,387.55x = 752,454.24
  5. Step 5: Solve for x
    x = 752,454.24/1,387.55
  6. Step 6: Final answer
    x = 542.29

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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.