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Finding the Fourth Proportional to 118.42, 177.60 and 72.71

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Solution

The fourth proportional to 118.42, 177.60 and 72.71 is: 109.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.42 : 177.60 = 72.71 : x
  2. Step 2: Convert to fraction form
    118.42/177.60 = 72.71/x
  3. Step 3: Cross multiply
    118.42x = 177.60 × 72.71
  4. Step 4: Simplify right side
    118.42x = 12,913.30
  5. Step 5: Solve for x
    x = 12,913.30/118.42
  6. Step 6: Final answer
    x = 109.05

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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.