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Finding the Fourth Proportional to 131.72, 181.75 and 81.90

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Solution

The fourth proportional to 131.72, 181.75 and 81.90 is: 113.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.72 : 181.75 = 81.90 : x
  2. Step 2: Convert to fraction form
    131.72/181.75 = 81.90/x
  3. Step 3: Cross multiply
    131.72x = 181.75 × 81.90
  4. Step 4: Simplify right side
    131.72x = 14,885.33
  5. Step 5: Solve for x
    x = 14,885.33/131.72
  6. Step 6: Final answer
    x = 113.01

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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.