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Finding the Fourth Proportional to 177.92, 245.51 and 99.21

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Solution

The fourth proportional to 177.92, 245.51 and 99.21 is: 136.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.92 : 245.51 = 99.21 : x
  2. Step 2: Convert to fraction form
    177.92/245.51 = 99.21/x
  3. Step 3: Cross multiply
    177.92x = 245.51 × 99.21
  4. Step 4: Simplify right side
    177.92x = 24,357.05
  5. Step 5: Solve for x
    x = 24,357.05/177.92
  6. Step 6: Final answer
    x = 136.90

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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.