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Finding the Fourth Proportional to 1,387.50, 2,081.65 and 521.88

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Solution

The fourth proportional to 1,387.50, 2,081.65 and 521.88 is: 782.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.50 : 2,081.65 = 521.88 : x
  2. Step 2: Convert to fraction form
    1,387.50/2,081.65 = 521.88/x
  3. Step 3: Cross multiply
    1,387.50x = 2,081.65 × 521.88
  4. Step 4: Simplify right side
    1,387.50x = 1,086,371.50
  5. Step 5: Solve for x
    x = 1,086,371.50/1,387.50
  6. Step 6: Final answer
    x = 782.97

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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.