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Finding the Fourth Proportional to 757.44, 1,139.04 and 636.48

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Solution

The fourth proportional to 757.44, 1,139.04 and 636.48 is: 957.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.44 : 1,139.04 = 636.48 : x
  2. Step 2: Convert to fraction form
    757.44/1,139.04 = 636.48/x
  3. Step 3: Cross multiply
    757.44x = 1,139.04 × 636.48
  4. Step 4: Simplify right side
    757.44x = 724,976.18
  5. Step 5: Solve for x
    x = 724,976.18/757.44
  6. Step 6: Final answer
    x = 957.14

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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.