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Finding the Fourth Proportional to 120.48, 179.30 and 115.36

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Solution

The fourth proportional to 120.48, 179.30 and 115.36 is: 171.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.48 : 179.30 = 115.36 : x
  2. Step 2: Convert to fraction form
    120.48/179.30 = 115.36/x
  3. Step 3: Cross multiply
    120.48x = 179.30 × 115.36
  4. Step 4: Simplify right side
    120.48x = 20,684.05
  5. Step 5: Solve for x
    x = 20,684.05/120.48
  6. Step 6: Final answer
    x = 171.68

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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.