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Finding the Fourth Proportional to 131, 196.50 and 45.50

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Solution

The fourth proportional to 131, 196.50 and 45.50 is: 68.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    131 : 196.50 = 45.50 : x
  2. Step 2: Convert to fraction form
    131/196.50 = 45.50/x
  3. Step 3: Cross multiply
    131x = 196.50 × 45.50
  4. Step 4: Simplify right side
    131x = 8,940.75
  5. Step 5: Solve for x
    x = 8,940.75/131
  6. Step 6: Final answer
    x = 68.25

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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.