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Finding the Fourth Proportional to 212.61, 318.75 and 143.97

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Solution

The fourth proportional to 212.61, 318.75 and 143.97 is: 215.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.61 : 318.75 = 143.97 : x
  2. Step 2: Convert to fraction form
    212.61/318.75 = 143.97/x
  3. Step 3: Cross multiply
    212.61x = 318.75 × 143.97
  4. Step 4: Simplify right side
    212.61x = 45,890.44
  5. Step 5: Solve for x
    x = 45,890.44/212.61
  6. Step 6: Final answer
    x = 215.84

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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.