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Finding the Fourth Proportional to 1,250.74, 1,876.41 and 428.79

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Solution

The fourth proportional to 1,250.74, 1,876.41 and 428.79 is: 643.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.74 : 1,876.41 = 428.79 : x
  2. Step 2: Convert to fraction form
    1,250.74/1,876.41 = 428.79/x
  3. Step 3: Cross multiply
    1,250.74x = 1,876.41 × 428.79
  4. Step 4: Simplify right side
    1,250.74x = 804,583.70
  5. Step 5: Solve for x
    x = 804,583.70/1,250.74
  6. Step 6: Final answer
    x = 643.29

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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.