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Finding the Fourth Proportional to 980.38, 1,351.70 and 717.94

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Solution

The fourth proportional to 980.38, 1,351.70 and 717.94 is: 989.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.38 : 1,351.70 = 717.94 : x
  2. Step 2: Convert to fraction form
    980.38/1,351.70 = 717.94/x
  3. Step 3: Cross multiply
    980.38x = 1,351.70 × 717.94
  4. Step 4: Simplify right side
    980.38x = 970,435.91
  5. Step 5: Solve for x
    x = 970,435.91/980.38
  6. Step 6: Final answer
    x = 989.86

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Double scale
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1.5x scale

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.