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Finding the Fourth Proportional to 131.09, 195.55 and 128.66

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Solution

The fourth proportional to 131.09, 195.55 and 128.66 is: 191.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.09 : 195.55 = 128.66 : x
  2. Step 2: Convert to fraction form
    131.09/195.55 = 128.66/x
  3. Step 3: Cross multiply
    131.09x = 195.55 × 128.66
  4. Step 4: Simplify right side
    131.09x = 25,158.16
  5. Step 5: Solve for x
    x = 25,158.16/131.09
  6. Step 6: Final answer
    x = 191.92

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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.