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Finding the Fourth Proportional to 1,248.50, 1,872.15 and 426.55

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Solution

The fourth proportional to 1,248.50, 1,872.15 and 426.55 is: 639.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.50 : 1,872.15 = 426.55 : x
  2. Step 2: Convert to fraction form
    1,248.50/1,872.15 = 426.55/x
  3. Step 3: Cross multiply
    1,248.50x = 1,872.15 × 426.55
  4. Step 4: Simplify right side
    1,248.50x = 798,565.58
  5. Step 5: Solve for x
    x = 798,565.58/1,248.50
  6. Step 6: Final answer
    x = 639.62

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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.