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Finding the Fourth Proportional to 212.22, 292.79 and 129.31

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Solution

The fourth proportional to 212.22, 292.79 and 129.31 is: 178.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.22 : 292.79 = 129.31 : x
  2. Step 2: Convert to fraction form
    212.22/292.79 = 129.31/x
  3. Step 3: Cross multiply
    212.22x = 292.79 × 129.31
  4. Step 4: Simplify right side
    212.22x = 37,859.21
  5. Step 5: Solve for x
    x = 37,859.21/212.22
  6. Step 6: Final answer
    x = 178.40

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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.