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Finding the Fourth Proportional to 177.72, 245.17 and 138.31

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Solution

The fourth proportional to 177.72, 245.17 and 138.31 is: 190.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.72 : 245.17 = 138.31 : x
  2. Step 2: Convert to fraction form
    177.72/245.17 = 138.31/x
  3. Step 3: Cross multiply
    177.72x = 245.17 × 138.31
  4. Step 4: Simplify right side
    177.72x = 33,909.22
  5. Step 5: Solve for x
    x = 33,909.22/177.72
  6. Step 6: Final answer
    x = 190.80

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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.