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Finding the Fourth Proportional to 118.64, 177.96 and 80.25

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Solution

The fourth proportional to 118.64, 177.96 and 80.25 is: 120.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.64 : 177.96 = 80.25 : x
  2. Step 2: Convert to fraction form
    118.64/177.96 = 80.25/x
  3. Step 3: Cross multiply
    118.64x = 177.96 × 80.25
  4. Step 4: Simplify right side
    118.64x = 14,281.29
  5. Step 5: Solve for x
    x = 14,281.29/118.64
  6. Step 6: Final answer
    x = 120.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.