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Finding the Fourth Proportional to 212.16, 292.72 and 129.24

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Solution

The fourth proportional to 212.16, 292.72 and 129.24 is: 178.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.16 : 292.72 = 129.24 : x
  2. Step 2: Convert to fraction form
    212.16/292.72 = 129.24/x
  3. Step 3: Cross multiply
    212.16x = 292.72 × 129.24
  4. Step 4: Simplify right side
    212.16x = 37,831.13
  5. Step 5: Solve for x
    x = 37,831.13/212.16
  6. Step 6: Final answer
    x = 178.31

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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.