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Finding the Fourth Proportional to 136.27, 203.32 and 128.51

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Solution

The fourth proportional to 136.27, 203.32 and 128.51 is: 191.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.27 : 203.32 = 128.51 : x
  2. Step 2: Convert to fraction form
    136.27/203.32 = 128.51/x
  3. Step 3: Cross multiply
    136.27x = 203.32 × 128.51
  4. Step 4: Simplify right side
    136.27x = 26,128.65
  5. Step 5: Solve for x
    x = 26,128.65/136.27
  6. Step 6: Final answer
    x = 191.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.