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Finding the Fourth Proportional to 1,248.59, 1,722.78 and 724.34

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Solution

The fourth proportional to 1,248.59, 1,722.78 and 724.34 is: 999.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.59 : 1,722.78 = 724.34 : x
  2. Step 2: Convert to fraction form
    1,248.59/1,722.78 = 724.34/x
  3. Step 3: Cross multiply
    1,248.59x = 1,722.78 × 724.34
  4. Step 4: Simplify right side
    1,248.59x = 1,247,869.85
  5. Step 5: Solve for x
    x = 1,247,869.85/1,248.59
  6. Step 6: Final answer
    x = 999.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.