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Finding the Fourth Proportional to 177.75, 245.36 and 138.87

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Solution

The fourth proportional to 177.75, 245.36 and 138.87 is: 191.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.75 : 245.36 = 138.87 : x
  2. Step 2: Convert to fraction form
    177.75/245.36 = 138.87/x
  3. Step 3: Cross multiply
    177.75x = 245.36 × 138.87
  4. Step 4: Simplify right side
    177.75x = 34,072.45
  5. Step 5: Solve for x
    x = 34,072.45/177.75
  6. Step 6: Final answer
    x = 191.69

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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.