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Finding the Fourth Proportional to 180.48, 249.12 and 115.16

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Solution

The fourth proportional to 180.48, 249.12 and 115.16 is: 158.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.48 : 249.12 = 115.16 : x
  2. Step 2: Convert to fraction form
    180.48/249.12 = 115.16/x
  3. Step 3: Cross multiply
    180.48x = 249.12 × 115.16
  4. Step 4: Simplify right side
    180.48x = 28,688.66
  5. Step 5: Solve for x
    x = 28,688.66/180.48
  6. Step 6: Final answer
    x = 158.96

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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.