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Finding the Fourth Proportional to 131.24, 181.12 and 76

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Solution

The fourth proportional to 131.24, 181.12 and 76 is: 104.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.24 : 181.12 = 76 : x
  2. Step 2: Convert to fraction form
    131.24/181.12 = 76/x
  3. Step 3: Cross multiply
    131.24x = 181.12 × 76
  4. Step 4: Simplify right side
    131.24x = 13,765.12
  5. Step 5: Solve for x
    x = 13,765.12/131.24
  6. Step 6: Final answer
    x = 104.89

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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.