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Finding the Fourth Proportional to 212.70, 318.42 and 135.74

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Solution

The fourth proportional to 212.70, 318.42 and 135.74 is: 203.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.70 : 318.42 = 135.74 : x
  2. Step 2: Convert to fraction form
    212.70/318.42 = 135.74/x
  3. Step 3: Cross multiply
    212.70x = 318.42 × 135.74
  4. Step 4: Simplify right side
    212.70x = 43,222.33
  5. Step 5: Solve for x
    x = 43,222.33/212.70
  6. Step 6: Final answer
    x = 203.21

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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.