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Finding the Fourth Proportional to 118.32, 178.26 and 90

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Solution

The fourth proportional to 118.32, 178.26 and 90 is: 135.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.32 : 178.26 = 90 : x
  2. Step 2: Convert to fraction form
    118.32/178.26 = 90/x
  3. Step 3: Cross multiply
    118.32x = 178.26 × 90
  4. Step 4: Simplify right side
    118.32x = 16,043.40
  5. Step 5: Solve for x
    x = 16,043.40/118.32
  6. Step 6: Final answer
    x = 135.59

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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.