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Finding the Fourth Proportional to 1,251.80, 1,878.13 and 386.11

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Solution

The fourth proportional to 1,251.80, 1,878.13 and 386.11 is: 579.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.80 : 1,878.13 = 386.11 : x
  2. Step 2: Convert to fraction form
    1,251.80/1,878.13 = 386.11/x
  3. Step 3: Cross multiply
    1,251.80x = 1,878.13 × 386.11
  4. Step 4: Simplify right side
    1,251.80x = 725,155.38
  5. Step 5: Solve for x
    x = 725,155.38/1,251.80
  6. Step 6: Final answer
    x = 579.29

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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.