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Finding the Fourth Proportional to 131.92, 181.99 and 79.47

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Solution

The fourth proportional to 131.92, 181.99 and 79.47 is: 109.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.92 : 181.99 = 79.47 : x
  2. Step 2: Convert to fraction form
    131.92/181.99 = 79.47/x
  3. Step 3: Cross multiply
    131.92x = 181.99 × 79.47
  4. Step 4: Simplify right side
    131.92x = 14,462.75
  5. Step 5: Solve for x
    x = 14,462.75/131.92
  6. Step 6: Final answer
    x = 109.63

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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.