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Finding the Fourth Proportional to 1,253.68, 1,729.20 and 729.32

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Solution

The fourth proportional to 1,253.68, 1,729.20 and 729.32 is: 1,005.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.68 : 1,729.20 = 729.32 : x
  2. Step 2: Convert to fraction form
    1,253.68/1,729.20 = 729.32/x
  3. Step 3: Cross multiply
    1,253.68x = 1,729.20 × 729.32
  4. Step 4: Simplify right side
    1,253.68x = 1,261,140.14
  5. Step 5: Solve for x
    x = 1,261,140.14/1,253.68
  6. Step 6: Final answer
    x = 1,005.95

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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.