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Finding the Fourth Proportional to 1,252.95, 1,728.85 and 721.81

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Solution

The fourth proportional to 1,252.95, 1,728.85 and 721.81 is: 995.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.95 : 1,728.85 = 721.81 : x
  2. Step 2: Convert to fraction form
    1,252.95/1,728.85 = 721.81/x
  3. Step 3: Cross multiply
    1,252.95x = 1,728.85 × 721.81
  4. Step 4: Simplify right side
    1,252.95x = 1,247,901.22
  5. Step 5: Solve for x
    x = 1,247,901.22/1,252.95
  6. Step 6: Final answer
    x = 995.97

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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.