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Finding the Fourth Proportional to 130.91, 196.48 and 85.12

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Solution

The fourth proportional to 130.91, 196.48 and 85.12 is: 127.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.91 : 196.48 = 85.12 : x
  2. Step 2: Convert to fraction form
    130.91/196.48 = 85.12/x
  3. Step 3: Cross multiply
    130.91x = 196.48 × 85.12
  4. Step 4: Simplify right side
    130.91x = 16,724.38
  5. Step 5: Solve for x
    x = 16,724.38/130.91
  6. Step 6: Final answer
    x = 127.75

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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.