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Finding the Fourth Proportional to 1,250.71, 1,876.47 and 428.96

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Solution

The fourth proportional to 1,250.71, 1,876.47 and 428.96 is: 643.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.71 : 1,876.47 = 428.96 : x
  2. Step 2: Convert to fraction form
    1,250.71/1,876.47 = 428.96/x
  3. Step 3: Cross multiply
    1,250.71x = 1,876.47 × 428.96
  4. Step 4: Simplify right side
    1,250.71x = 804,928.43
  5. Step 5: Solve for x
    x = 804,928.43/1,250.71
  6. Step 6: Final answer
    x = 643.58

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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.