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Finding the Fourth Proportional to 131.31, 196.60 and 85.53

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Solution

The fourth proportional to 131.31, 196.60 and 85.53 is: 128.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.31 : 196.60 = 85.53 : x
  2. Step 2: Convert to fraction form
    131.31/196.60 = 85.53/x
  3. Step 3: Cross multiply
    131.31x = 196.60 × 85.53
  4. Step 4: Simplify right side
    131.31x = 16,815.20
  5. Step 5: Solve for x
    x = 16,815.20/131.31
  6. Step 6: Final answer
    x = 128.06

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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.