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Finding the Fourth Proportional to 131.96, 182.12 and 76.70

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Solution

The fourth proportional to 131.96, 182.12 and 76.70 is: 105.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.96 : 182.12 = 76.70 : x
  2. Step 2: Convert to fraction form
    131.96/182.12 = 76.70/x
  3. Step 3: Cross multiply
    131.96x = 182.12 × 76.70
  4. Step 4: Simplify right side
    131.96x = 13,968.68
  5. Step 5: Solve for x
    x = 13,968.68/131.96
  6. Step 6: Final answer
    x = 105.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.