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Finding the Fourth Proportional to 131.19, 196.78 and 45.69

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Solution

The fourth proportional to 131.19, 196.78 and 45.69 is: 68.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.19 : 196.78 = 45.69 : x
  2. Step 2: Convert to fraction form
    131.19/196.78 = 45.69/x
  3. Step 3: Cross multiply
    131.19x = 196.78 × 45.69
  4. Step 4: Simplify right side
    131.19x = 8,990.88
  5. Step 5: Solve for x
    x = 8,990.88/131.19
  6. Step 6: Final answer
    x = 68.53

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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.