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Finding the Fourth Proportional to 135.03, 186.19 and 121.91

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Solution

The fourth proportional to 135.03, 186.19 and 121.91 is: 168.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.03 : 186.19 = 121.91 : x
  2. Step 2: Convert to fraction form
    135.03/186.19 = 121.91/x
  3. Step 3: Cross multiply
    135.03x = 186.19 × 121.91
  4. Step 4: Simplify right side
    135.03x = 22,698.58
  5. Step 5: Solve for x
    x = 22,698.58/135.03
  6. Step 6: Final answer
    x = 168.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.