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Finding the Fourth Proportional to 818.20, 1,220.99 and 674.20

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Solution

The fourth proportional to 818.20, 1,220.99 and 674.20 is: 1,006.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.20 : 1,220.99 = 674.20 : x
  2. Step 2: Convert to fraction form
    818.20/1,220.99 = 674.20/x
  3. Step 3: Cross multiply
    818.20x = 1,220.99 × 674.20
  4. Step 4: Simplify right side
    818.20x = 823,191.46
  5. Step 5: Solve for x
    x = 823,191.46/818.20
  6. Step 6: Final answer
    x = 1,006.10

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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 (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.