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Finding the Fourth Proportional to 135.80, 186.37 and 121.90

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Solution

The fourth proportional to 135.80, 186.37 and 121.90 is: 167.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.80 : 186.37 = 121.90 : x
  2. Step 2: Convert to fraction form
    135.80/186.37 = 121.90/x
  3. Step 3: Cross multiply
    135.80x = 186.37 × 121.90
  4. Step 4: Simplify right side
    135.80x = 22,718.50
  5. Step 5: Solve for x
    x = 22,718.50/135.80
  6. Step 6: Final answer
    x = 167.29

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.