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Finding the Fourth Proportional to 1,247.85, 1,872.18 and 426.65

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Solution

The fourth proportional to 1,247.85, 1,872.18 and 426.65 is: 640.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.85 : 1,872.18 = 426.65 : x
  2. Step 2: Convert to fraction form
    1,247.85/1,872.18 = 426.65/x
  3. Step 3: Cross multiply
    1,247.85x = 1,872.18 × 426.65
  4. Step 4: Simplify right side
    1,247.85x = 798,765.60
  5. Step 5: Solve for x
    x = 798,765.60/1,247.85
  6. Step 6: Final answer
    x = 640.11

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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.