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Finding the Fourth Proportional to 1,358.28, 2,039.28 and 744.12

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Solution

The fourth proportional to 1,358.28, 2,039.28 and 744.12 is: 1,117.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.28 : 2,039.28 = 744.12 : x
  2. Step 2: Convert to fraction form
    1,358.28/2,039.28 = 744.12/x
  3. Step 3: Cross multiply
    1,358.28x = 2,039.28 × 744.12
  4. Step 4: Simplify right side
    1,358.28x = 1,517,469.03
  5. Step 5: Solve for x
    x = 1,517,469.03/1,358.28
  6. Step 6: Final answer
    x = 1,117.20

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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.