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Finding the Fourth Proportional to 212.38, 318.36 and 143.74

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Solution

The fourth proportional to 212.38, 318.36 and 143.74 is: 215.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.38 : 318.36 = 143.74 : x
  2. Step 2: Convert to fraction form
    212.38/318.36 = 143.74/x
  3. Step 3: Cross multiply
    212.38x = 318.36 × 143.74
  4. Step 4: Simplify right side
    212.38x = 45,761.07
  5. Step 5: Solve for x
    x = 45,761.07/212.38
  6. Step 6: Final answer
    x = 215.47

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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.