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Finding the Fourth Proportional to 1,387.44, 2,081.16 and 521.15

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Solution

The fourth proportional to 1,387.44, 2,081.16 and 521.15 is: 781.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.44 : 2,081.16 = 521.15 : x
  2. Step 2: Convert to fraction form
    1,387.44/2,081.16 = 521.15/x
  3. Step 3: Cross multiply
    1,387.44x = 2,081.16 × 521.15
  4. Step 4: Simplify right side
    1,387.44x = 1,084,586.13
  5. Step 5: Solve for x
    x = 1,084,586.13/1,387.44
  6. Step 6: Final answer
    x = 781.72

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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.