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Finding the Fourth Proportional to 775.23, 1,156.11 and 660.41

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Solution

The fourth proportional to 775.23, 1,156.11 and 660.41 is: 984.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.23 : 1,156.11 = 660.41 : x
  2. Step 2: Convert to fraction form
    775.23/1,156.11 = 660.41/x
  3. Step 3: Cross multiply
    775.23x = 1,156.11 × 660.41
  4. Step 4: Simplify right side
    775.23x = 763,506.61
  5. Step 5: Solve for x
    x = 763,506.61/775.23
  6. Step 6: Final answer
    x = 984.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.