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Finding the Fourth Proportional to 127.72, 176.24 and 78.58

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Solution

The fourth proportional to 127.72, 176.24 and 78.58 is: 108.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.72 : 176.24 = 78.58 : x
  2. Step 2: Convert to fraction form
    127.72/176.24 = 78.58/x
  3. Step 3: Cross multiply
    127.72x = 176.24 × 78.58
  4. Step 4: Simplify right side
    127.72x = 13,848.94
  5. Step 5: Solve for x
    x = 13,848.94/127.72
  6. Step 6: Final answer
    x = 108.43

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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.