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Finding the Fourth Proportional to 1,248.27, 1,871.95 and 426.32

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Solution

The fourth proportional to 1,248.27, 1,871.95 and 426.32 is: 639.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.27 : 1,871.95 = 426.32 : x
  2. Step 2: Convert to fraction form
    1,248.27/1,871.95 = 426.32/x
  3. Step 3: Cross multiply
    1,248.27x = 1,871.95 × 426.32
  4. Step 4: Simplify right side
    1,248.27x = 798,049.72
  5. Step 5: Solve for x
    x = 798,049.72/1,248.27
  6. Step 6: Final answer
    x = 639.32

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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.