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Finding the Fourth Proportional to 212.31, 318.20 and 114.86

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Solution

The fourth proportional to 212.31, 318.20 and 114.86 is: 172.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.31 : 318.20 = 114.86 : x
  2. Step 2: Convert to fraction form
    212.31/318.20 = 114.86/x
  3. Step 3: Cross multiply
    212.31x = 318.20 × 114.86
  4. Step 4: Simplify right side
    212.31x = 36,549.53
  5. Step 5: Solve for x
    x = 36,549.53/212.31
  6. Step 6: Final answer
    x = 172.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.