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Finding the Fourth Proportional to 1,251.22, 1,876.92 and 385.42

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Solution

The fourth proportional to 1,251.22, 1,876.92 and 385.42 is: 578.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.22 : 1,876.92 = 385.42 : x
  2. Step 2: Convert to fraction form
    1,251.22/1,876.92 = 385.42/x
  3. Step 3: Cross multiply
    1,251.22x = 1,876.92 × 385.42
  4. Step 4: Simplify right side
    1,251.22x = 723,402.51
  5. Step 5: Solve for x
    x = 723,402.51/1,251.22
  6. Step 6: Final answer
    x = 578.16

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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.