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Finding the Fourth Proportional to 1,251.88, 1,878.10 and 386.28

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Solution

The fourth proportional to 1,251.88, 1,878.10 and 386.28 is: 579.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.88 : 1,878.10 = 386.28 : x
  2. Step 2: Convert to fraction form
    1,251.88/1,878.10 = 386.28/x
  3. Step 3: Cross multiply
    1,251.88x = 1,878.10 × 386.28
  4. Step 4: Simplify right side
    1,251.88x = 725,472.47
  5. Step 5: Solve for x
    x = 725,472.47/1,251.88
  6. Step 6: Final answer
    x = 579.51

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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.