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Finding the Fourth Proportional to 212.80, 293.46 and 129.91

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Solution

The fourth proportional to 212.80, 293.46 and 129.91 is: 179.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.80 : 293.46 = 129.91 : x
  2. Step 2: Convert to fraction form
    212.80/293.46 = 129.91/x
  3. Step 3: Cross multiply
    212.80x = 293.46 × 129.91
  4. Step 4: Simplify right side
    212.80x = 38,123.39
  5. Step 5: Solve for x
    x = 38,123.39/212.80
  6. Step 6: Final answer
    x = 179.15

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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.