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Finding the Fourth Proportional to 1,249.62, 1,874.02 and 428.01

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Solution

The fourth proportional to 1,249.62, 1,874.02 and 428.01 is: 641.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.62 : 1,874.02 = 428.01 : x
  2. Step 2: Convert to fraction form
    1,249.62/1,874.02 = 428.01/x
  3. Step 3: Cross multiply
    1,249.62x = 1,874.02 × 428.01
  4. Step 4: Simplify right side
    1,249.62x = 802,099.30
  5. Step 5: Solve for x
    x = 802,099.30/1,249.62
  6. Step 6: Final answer
    x = 641.87

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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.