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Finding the Fourth Proportional to 212.88, 318.42 and 180.48

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Solution

The fourth proportional to 212.88, 318.42 and 180.48 is: 269.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.88 : 318.42 = 180.48 : x
  2. Step 2: Convert to fraction form
    212.88/318.42 = 180.48/x
  3. Step 3: Cross multiply
    212.88x = 318.42 × 180.48
  4. Step 4: Simplify right side
    212.88x = 57,468.44
  5. Step 5: Solve for x
    x = 57,468.44/212.88
  6. Step 6: Final answer
    x = 269.96

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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.