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Finding the Fourth Proportional to 1,250.76, 1,876.25 and 428.70

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Solution

The fourth proportional to 1,250.76, 1,876.25 and 428.70 is: 643.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.76 : 1,876.25 = 428.70 : x
  2. Step 2: Convert to fraction form
    1,250.76/1,876.25 = 428.70/x
  3. Step 3: Cross multiply
    1,250.76x = 1,876.25 × 428.70
  4. Step 4: Simplify right side
    1,250.76x = 804,346.23
  5. Step 5: Solve for x
    x = 804,346.23/1,250.76
  6. Step 6: Final answer
    x = 643.09

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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.