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Finding the Fourth Proportional to 812.08, 1,122.96 and 615.52

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Solution

The fourth proportional to 812.08, 1,122.96 and 615.52 is: 851.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.08 : 1,122.96 = 615.52 : x
  2. Step 2: Convert to fraction form
    812.08/1,122.96 = 615.52/x
  3. Step 3: Cross multiply
    812.08x = 1,122.96 × 615.52
  4. Step 4: Simplify right side
    812.08x = 691,204.34
  5. Step 5: Solve for x
    x = 691,204.34/812.08
  6. Step 6: Final answer
    x = 851.15

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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.