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Finding the Fourth Proportional to 1,251.92, 1,878.96 and 675.20

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Solution

The fourth proportional to 1,251.92, 1,878.96 and 675.20 is: 1,013.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.92 : 1,878.96 = 675.20 : x
  2. Step 2: Convert to fraction form
    1,251.92/1,878.96 = 675.20/x
  3. Step 3: Cross multiply
    1,251.92x = 1,878.96 × 675.20
  4. Step 4: Simplify right side
    1,251.92x = 1,268,673.79
  5. Step 5: Solve for x
    x = 1,268,673.79/1,251.92
  6. Step 6: Final answer
    x = 1,013.38

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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.