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Finding the Fourth Proportional to 1,251.33, 1,877.00 and 429.59

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Solution

The fourth proportional to 1,251.33, 1,877.00 and 429.59 is: 644.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.33 : 1,877.00 = 429.59 : x
  2. Step 2: Convert to fraction form
    1,251.33/1,877.00 = 429.59/x
  3. Step 3: Cross multiply
    1,251.33x = 1,877.00 × 429.59
  4. Step 4: Simplify right side
    1,251.33x = 806,328.90
  5. Step 5: Solve for x
    x = 806,328.90/1,251.33
  6. Step 6: Final answer
    x = 644.38

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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.