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Finding the Fourth Proportional to 212.12, 318.36 and 114.69

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Solution

The fourth proportional to 212.12, 318.36 and 114.69 is: 172.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.12 : 318.36 = 114.69 : x
  2. Step 2: Convert to fraction form
    212.12/318.36 = 114.69/x
  3. Step 3: Cross multiply
    212.12x = 318.36 × 114.69
  4. Step 4: Simplify right side
    212.12x = 36,512.71
  5. Step 5: Solve for x
    x = 36,512.71/212.12
  6. Step 6: Final answer
    x = 172.13

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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.