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Finding the Fourth Proportional to 131.45, 196.85 and 70.54

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Solution

The fourth proportional to 131.45, 196.85 and 70.54 is: 105.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.45 : 196.85 = 70.54 : x
  2. Step 2: Convert to fraction form
    131.45/196.85 = 70.54/x
  3. Step 3: Cross multiply
    131.45x = 196.85 × 70.54
  4. Step 4: Simplify right side
    131.45x = 13,885.48
  5. Step 5: Solve for x
    x = 13,885.48/131.45
  6. Step 6: Final answer
    x = 105.64

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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.