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Finding the Fourth Proportional to 212.78, 318.38 and 130.56

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Solution

The fourth proportional to 212.78, 318.38 and 130.56 is: 195.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.78 : 318.38 = 130.56 : x
  2. Step 2: Convert to fraction form
    212.78/318.38 = 130.56/x
  3. Step 3: Cross multiply
    212.78x = 318.38 × 130.56
  4. Step 4: Simplify right side
    212.78x = 41,567.04
  5. Step 5: Solve for x
    x = 41,567.04/212.78
  6. Step 6: Final answer
    x = 195.36

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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.