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Finding the Fourth Proportional to 1,248.64, 1,872.43 and 426.53

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Solution

The fourth proportional to 1,248.64, 1,872.43 and 426.53 is: 639.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.64 : 1,872.43 = 426.53 : x
  2. Step 2: Convert to fraction form
    1,248.64/1,872.43 = 426.53/x
  3. Step 3: Cross multiply
    1,248.64x = 1,872.43 × 426.53
  4. Step 4: Simplify right side
    1,248.64x = 798,651.18
  5. Step 5: Solve for x
    x = 798,651.18/1,248.64
  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.