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Finding the Fourth Proportional to 1,073.78, 1,481.40 and 724.70

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Solution

The fourth proportional to 1,073.78, 1,481.40 and 724.70 is: 999.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073.78 : 1,481.40 = 724.70 : x
  2. Step 2: Convert to fraction form
    1,073.78/1,481.40 = 724.70/x
  3. Step 3: Cross multiply
    1,073.78x = 1,481.40 × 724.70
  4. Step 4: Simplify right side
    1,073.78x = 1,073,570.58
  5. Step 5: Solve for x
    x = 1,073,570.58/1,073.78
  6. Step 6: Final answer
    x = 999.80

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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.