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Finding the Fourth Proportional to 815.57, 1,123.12 and 697.11

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Solution

The fourth proportional to 815.57, 1,123.12 and 697.11 is: 959.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.57 : 1,123.12 = 697.11 : x
  2. Step 2: Convert to fraction form
    815.57/1,123.12 = 697.11/x
  3. Step 3: Cross multiply
    815.57x = 1,123.12 × 697.11
  4. Step 4: Simplify right side
    815.57x = 782,930.92
  5. Step 5: Solve for x
    x = 782,930.92/815.57
  6. Step 6: Final answer
    x = 959.98

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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.