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Finding the Fourth Proportional to 129.65, 194.55 and 48.56

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Solution

The fourth proportional to 129.65, 194.55 and 48.56 is: 72.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.65 : 194.55 = 48.56 : x
  2. Step 2: Convert to fraction form
    129.65/194.55 = 48.56/x
  3. Step 3: Cross multiply
    129.65x = 194.55 × 48.56
  4. Step 4: Simplify right side
    129.65x = 9,446.38
  5. Step 5: Solve for x
    x = 9,446.38/129.65
  6. Step 6: Final answer
    x = 72.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.