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Finding the Fourth Proportional to 1,251.80, 1,877.78 and 386.32

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Solution

The fourth proportional to 1,251.80, 1,877.78 and 386.32 is: 579.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.80 : 1,877.78 = 386.32 : x
  2. Step 2: Convert to fraction form
    1,251.80/1,877.78 = 386.32/x
  3. Step 3: Cross multiply
    1,251.80x = 1,877.78 × 386.32
  4. Step 4: Simplify right side
    1,251.80x = 725,423.97
  5. Step 5: Solve for x
    x = 725,423.97/1,251.80
  6. Step 6: Final answer
    x = 579.50

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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.