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Finding the Fourth Proportional to 1,251.43, 1,728.80 and 987.62

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Solution

The fourth proportional to 1,251.43, 1,728.80 and 987.62 is: 1,364.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.43 : 1,728.80 = 987.62 : x
  2. Step 2: Convert to fraction form
    1,251.43/1,728.80 = 987.62/x
  3. Step 3: Cross multiply
    1,251.43x = 1,728.80 × 987.62
  4. Step 4: Simplify right side
    1,251.43x = 1,707,400.08
  5. Step 5: Solve for x
    x = 1,707,400.08/1,251.43
  6. Step 6: Final answer
    x = 1,364.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.