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Finding the Fourth Proportional to 131.40, 198.02 and 118.58

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Solution

The fourth proportional to 131.40, 198.02 and 118.58 is: 178.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.40 : 198.02 = 118.58 : x
  2. Step 2: Convert to fraction form
    131.40/198.02 = 118.58/x
  3. Step 3: Cross multiply
    131.40x = 198.02 × 118.58
  4. Step 4: Simplify right side
    131.40x = 23,481.21
  5. Step 5: Solve for x
    x = 23,481.21/131.40
  6. Step 6: Final answer
    x = 178.70

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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.