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Finding the Fourth Proportional to 212.31, 317.85 and 130.90

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Solution

The fourth proportional to 212.31, 317.85 and 130.90 is: 195.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.31 : 317.85 = 130.90 : x
  2. Step 2: Convert to fraction form
    212.31/317.85 = 130.90/x
  3. Step 3: Cross multiply
    212.31x = 317.85 × 130.90
  4. Step 4: Simplify right side
    212.31x = 41,606.57
  5. Step 5: Solve for x
    x = 41,606.57/212.31
  6. Step 6: Final answer
    x = 195.97

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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.