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Finding the Fourth Proportional to 820.77, 1,229.53 and 615.57

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Solution

The fourth proportional to 820.77, 1,229.53 and 615.57 is: 922.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.77 : 1,229.53 = 615.57 : x
  2. Step 2: Convert to fraction form
    820.77/1,229.53 = 615.57/x
  3. Step 3: Cross multiply
    820.77x = 1,229.53 × 615.57
  4. Step 4: Simplify right side
    820.77x = 756,861.78
  5. Step 5: Solve for x
    x = 756,861.78/820.77
  6. Step 6: Final answer
    x = 922.14

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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.