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Finding the Fourth Proportional to 1,158.48, 1,735.92 and 725.28

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Solution

The fourth proportional to 1,158.48, 1,735.92 and 725.28 is: 1,086.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,158.48 : 1,735.92 = 725.28 : x
  2. Step 2: Convert to fraction form
    1,158.48/1,735.92 = 725.28/x
  3. Step 3: Cross multiply
    1,158.48x = 1,735.92 × 725.28
  4. Step 4: Simplify right side
    1,158.48x = 1,259,028.06
  5. Step 5: Solve for x
    x = 1,259,028.06/1,158.48
  6. Step 6: Final answer
    x = 1,086.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.