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Finding the Fourth Proportional to 135.76, 187.40 and 121.36

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Solution

The fourth proportional to 135.76, 187.40 and 121.36 is: 167.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.76 : 187.40 = 121.36 : x
  2. Step 2: Convert to fraction form
    135.76/187.40 = 121.36/x
  3. Step 3: Cross multiply
    135.76x = 187.40 × 121.36
  4. Step 4: Simplify right side
    135.76x = 22,742.86
  5. Step 5: Solve for x
    x = 22,742.86/135.76
  6. Step 6: Final answer
    x = 167.52

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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.