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Finding the Fourth Proportional to 949.90, 1,425.39 and 758.74

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Solution

The fourth proportional to 949.90, 1,425.39 and 758.74 is: 1,138.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.90 : 1,425.39 = 758.74 : x
  2. Step 2: Convert to fraction form
    949.90/1,425.39 = 758.74/x
  3. Step 3: Cross multiply
    949.90x = 1,425.39 × 758.74
  4. Step 4: Simplify right side
    949.90x = 1,081,489.49
  5. Step 5: Solve for x
    x = 1,081,489.49/949.90
  6. Step 6: Final answer
    x = 1,138.54

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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.