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Finding the Fourth Proportional to 118.71, 178.70 and 91.98

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Solution

The fourth proportional to 118.71, 178.70 and 91.98 is: 138.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.71 : 178.70 = 91.98 : x
  2. Step 2: Convert to fraction form
    118.71/178.70 = 91.98/x
  3. Step 3: Cross multiply
    118.71x = 178.70 × 91.98
  4. Step 4: Simplify right side
    118.71x = 16,436.37
  5. Step 5: Solve for x
    x = 16,436.37/118.71
  6. Step 6: Final answer
    x = 138.46

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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.