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Finding the Fourth Proportional to 212.15, 292.71 and 129.23

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Solution

The fourth proportional to 212.15, 292.71 and 129.23 is: 178.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.15 : 292.71 = 129.23 : x
  2. Step 2: Convert to fraction form
    212.15/292.71 = 129.23/x
  3. Step 3: Cross multiply
    212.15x = 292.71 × 129.23
  4. Step 4: Simplify right side
    212.15x = 37,825.45
  5. Step 5: Solve for x
    x = 37,825.45/212.15
  6. Step 6: Final answer
    x = 178.30

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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.