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Finding the Fourth Proportional to 1,253.13, 1,729.40 and 729.20

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Solution

The fourth proportional to 1,253.13, 1,729.40 and 729.20 is: 1,006.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.13 : 1,729.40 = 729.20 : x
  2. Step 2: Convert to fraction form
    1,253.13/1,729.40 = 729.20/x
  3. Step 3: Cross multiply
    1,253.13x = 1,729.40 × 729.20
  4. Step 4: Simplify right side
    1,253.13x = 1,261,078.48
  5. Step 5: Solve for x
    x = 1,261,078.48/1,253.13
  6. Step 6: Final answer
    x = 1,006.34

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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.