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Finding the Fourth Proportional to 680.74, 1,021.11 and 356.34

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Solution

The fourth proportional to 680.74, 1,021.11 and 356.34 is: 534.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.74 : 1,021.11 = 356.34 : x
  2. Step 2: Convert to fraction form
    680.74/1,021.11 = 356.34/x
  3. Step 3: Cross multiply
    680.74x = 1,021.11 × 356.34
  4. Step 4: Simplify right side
    680.74x = 363,862.34
  5. Step 5: Solve for x
    x = 363,862.34/680.74
  6. Step 6: Final answer
    x = 534.51

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Double scale
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Similar ratio
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1.5x scale

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.