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Finding the Fourth Proportional to 131.19, 196.56 and 85.38

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Solution

The fourth proportional to 131.19, 196.56 and 85.38 is: 127.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.19 : 196.56 = 85.38 : x
  2. Step 2: Convert to fraction form
    131.19/196.56 = 85.38/x
  3. Step 3: Cross multiply
    131.19x = 196.56 × 85.38
  4. Step 4: Simplify right side
    131.19x = 16,782.29
  5. Step 5: Solve for x
    x = 16,782.29/131.19
  6. Step 6: Final answer
    x = 127.92

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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.