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Finding the Fourth Proportional to 131.19, 196.51 and 85.39

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Solution

The fourth proportional to 131.19, 196.51 and 85.39 is: 127.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.19 : 196.51 = 85.39 : x
  2. Step 2: Convert to fraction form
    131.19/196.51 = 85.39/x
  3. Step 3: Cross multiply
    131.19x = 196.51 × 85.39
  4. Step 4: Simplify right side
    131.19x = 16,780.55
  5. Step 5: Solve for x
    x = 16,780.55/131.19
  6. Step 6: Final answer
    x = 127.91

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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.