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Finding the Fourth Proportional to 815.27, 1,125.87 and 696.55

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Solution

The fourth proportional to 815.27, 1,125.87 and 696.55 is: 961.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.27 : 1,125.87 = 696.55 : x
  2. Step 2: Convert to fraction form
    815.27/1,125.87 = 696.55/x
  3. Step 3: Cross multiply
    815.27x = 1,125.87 × 696.55
  4. Step 4: Simplify right side
    815.27x = 784,225.35
  5. Step 5: Solve for x
    x = 784,225.35/815.27
  6. Step 6: Final answer
    x = 961.92

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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.