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Finding the Fourth Proportional to 728.95, 1,085.19 and 724.63

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Solution

The fourth proportional to 728.95, 1,085.19 and 724.63 is: 1,078.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.95 : 1,085.19 = 724.63 : x
  2. Step 2: Convert to fraction form
    728.95/1,085.19 = 724.63/x
  3. Step 3: Cross multiply
    728.95x = 1,085.19 × 724.63
  4. Step 4: Simplify right side
    728.95x = 786,357.61
  5. Step 5: Solve for x
    x = 786,357.61/728.95
  6. Step 6: Final answer
    x = 1,078.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.