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Finding the Fourth Proportional to 118.09, 177.87 and 91.22

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Solution

The fourth proportional to 118.09, 177.87 and 91.22 is: 137.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.09 : 177.87 = 91.22 : x
  2. Step 2: Convert to fraction form
    118.09/177.87 = 91.22/x
  3. Step 3: Cross multiply
    118.09x = 177.87 × 91.22
  4. Step 4: Simplify right side
    118.09x = 16,225.30
  5. Step 5: Solve for x
    x = 16,225.30/118.09
  6. Step 6: Final answer
    x = 137.40

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.