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Finding the Fourth Proportional to 135.93, 187.16 and 121.74

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Solution

The fourth proportional to 135.93, 187.16 and 121.74 is: 167.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.93 : 187.16 = 121.74 : x
  2. Step 2: Convert to fraction form
    135.93/187.16 = 121.74/x
  3. Step 3: Cross multiply
    135.93x = 187.16 × 121.74
  4. Step 4: Simplify right side
    135.93x = 22,784.86
  5. Step 5: Solve for x
    x = 22,784.86/135.93
  6. Step 6: Final answer
    x = 167.62

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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.