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Finding the Fourth Proportional to 212.42, 293.07 and 129.50

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Solution

The fourth proportional to 212.42, 293.07 and 129.50 is: 178.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.42 : 293.07 = 129.50 : x
  2. Step 2: Convert to fraction form
    212.42/293.07 = 129.50/x
  3. Step 3: Cross multiply
    212.42x = 293.07 × 129.50
  4. Step 4: Simplify right side
    212.42x = 37,951.10
  5. Step 5: Solve for x
    x = 37,951.10/212.42
  6. Step 6: Final answer
    x = 178.66

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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.