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Finding the Fourth Proportional to 118.48, 177.80 and 91.35

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Solution

The fourth proportional to 118.48, 177.80 and 91.35 is: 137.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.48 : 177.80 = 91.35 : x
  2. Step 2: Convert to fraction form
    118.48/177.80 = 91.35/x
  3. Step 3: Cross multiply
    118.48x = 177.80 × 91.35
  4. Step 4: Simplify right side
    118.48x = 16,242.03
  5. Step 5: Solve for x
    x = 16,242.03/118.48
  6. Step 6: Final answer
    x = 137.09

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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.