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Finding the Fourth Proportional to 1,251.15, 1,876.74 and 385.46

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Solution

The fourth proportional to 1,251.15, 1,876.74 and 385.46 is: 578.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.15 : 1,876.74 = 385.46 : x
  2. Step 2: Convert to fraction form
    1,251.15/1,876.74 = 385.46/x
  3. Step 3: Cross multiply
    1,251.15x = 1,876.74 × 385.46
  4. Step 4: Simplify right side
    1,251.15x = 723,398.82
  5. Step 5: Solve for x
    x = 723,398.82/1,251.15
  6. Step 6: Final answer
    x = 578.19

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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.