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Finding the Fourth Proportional to 118.31, 176.33 and 115.05

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Solution

The fourth proportional to 118.31, 176.33 and 115.05 is: 171.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.31 : 176.33 = 115.05 : x
  2. Step 2: Convert to fraction form
    118.31/176.33 = 115.05/x
  3. Step 3: Cross multiply
    118.31x = 176.33 × 115.05
  4. Step 4: Simplify right side
    118.31x = 20,285.58
  5. Step 5: Solve for x
    x = 20,285.58/118.31
  6. Step 6: Final answer
    x = 171.46

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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.