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Finding the Fourth Proportional to 131.88, 181.84 and 99.20

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Solution

The fourth proportional to 131.88, 181.84 and 99.20 is: 136.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.88 : 181.84 = 99.20 : x
  2. Step 2: Convert to fraction form
    131.88/181.84 = 99.20/x
  3. Step 3: Cross multiply
    131.88x = 181.84 × 99.20
  4. Step 4: Simplify right side
    131.88x = 18,038.53
  5. Step 5: Solve for x
    x = 18,038.53/131.88
  6. Step 6: Final answer
    x = 136.78

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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.