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Finding the Fourth Proportional to 131.86, 181.99 and 76.63

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Solution

The fourth proportional to 131.86, 181.99 and 76.63 is: 105.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.86 : 181.99 = 76.63 : x
  2. Step 2: Convert to fraction form
    131.86/181.99 = 76.63/x
  3. Step 3: Cross multiply
    131.86x = 181.99 × 76.63
  4. Step 4: Simplify right side
    131.86x = 13,945.89
  5. Step 5: Solve for x
    x = 13,945.89/131.86
  6. Step 6: Final answer
    x = 105.76

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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.