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Finding the Fourth Proportional to 1,251.38, 1,877.40 and 429.66

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Solution

The fourth proportional to 1,251.38, 1,877.40 and 429.66 is: 644.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.38 : 1,877.40 = 429.66 : x
  2. Step 2: Convert to fraction form
    1,251.38/1,877.40 = 429.66/x
  3. Step 3: Cross multiply
    1,251.38x = 1,877.40 × 429.66
  4. Step 4: Simplify right side
    1,251.38x = 806,643.68
  5. Step 5: Solve for x
    x = 806,643.68/1,251.38
  6. Step 6: Final answer
    x = 644.60

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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.