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Finding the Fourth Proportional to 816.86, 1,123.92 and 711.56

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Solution

The fourth proportional to 816.86, 1,123.92 and 711.56 is: 979.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.86 : 1,123.92 = 711.56 : x
  2. Step 2: Convert to fraction form
    816.86/1,123.92 = 711.56/x
  3. Step 3: Cross multiply
    816.86x = 1,123.92 × 711.56
  4. Step 4: Simplify right side
    816.86x = 799,736.52
  5. Step 5: Solve for x
    x = 799,736.52/816.86
  6. Step 6: Final answer
    x = 979.04

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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.