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Finding the Fourth Proportional to 680.74, 1,021.11 and 247.66

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Solution

The fourth proportional to 680.74, 1,021.11 and 247.66 is: 371.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.74 : 1,021.11 = 247.66 : x
  2. Step 2: Convert to fraction form
    680.74/1,021.11 = 247.66/x
  3. Step 3: Cross multiply
    680.74x = 1,021.11 × 247.66
  4. Step 4: Simplify right side
    680.74x = 252,888.10
  5. Step 5: Solve for x
    x = 252,888.10/680.74
  6. Step 6: Final answer
    x = 371.49

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Double scale
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Similar ratio
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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.