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Finding the Fourth Proportional to 194.71, 268.80 and 129.31

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Solution

The fourth proportional to 194.71, 268.80 and 129.31 is: 178.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.71 : 268.80 = 129.31 : x
  2. Step 2: Convert to fraction form
    194.71/268.80 = 129.31/x
  3. Step 3: Cross multiply
    194.71x = 268.80 × 129.31
  4. Step 4: Simplify right side
    194.71x = 34,758.53
  5. Step 5: Solve for x
    x = 34,758.53/194.71
  6. Step 6: Final answer
    x = 178.51

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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.