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Finding the Fourth Proportional to 1,251.13, 1,872.62 and 665.29

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Solution

The fourth proportional to 1,251.13, 1,872.62 and 665.29 is: 995.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.13 : 1,872.62 = 665.29 : x
  2. Step 2: Convert to fraction form
    1,251.13/1,872.62 = 665.29/x
  3. Step 3: Cross multiply
    1,251.13x = 1,872.62 × 665.29
  4. Step 4: Simplify right side
    1,251.13x = 1,245,822.67
  5. Step 5: Solve for x
    x = 1,245,822.67/1,251.13
  6. Step 6: Final answer
    x = 995.76

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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.