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Finding the Fourth Proportional to 127.85, 176.45 and 78.76

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Solution

The fourth proportional to 127.85, 176.45 and 78.76 is: 108.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.85 : 176.45 = 78.76 : x
  2. Step 2: Convert to fraction form
    127.85/176.45 = 78.76/x
  3. Step 3: Cross multiply
    127.85x = 176.45 × 78.76
  4. Step 4: Simplify right side
    127.85x = 13,897.20
  5. Step 5: Solve for x
    x = 13,897.20/127.85
  6. Step 6: Final answer
    x = 108.70

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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.