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Finding the Fourth Proportional to 127.77, 176.20 and 81.06

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Solution

The fourth proportional to 127.77, 176.20 and 81.06 is: 111.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.77 : 176.20 = 81.06 : x
  2. Step 2: Convert to fraction form
    127.77/176.20 = 81.06/x
  3. Step 3: Cross multiply
    127.77x = 176.20 × 81.06
  4. Step 4: Simplify right side
    127.77x = 14,282.77
  5. Step 5: Solve for x
    x = 14,282.77/127.77
  6. Step 6: Final answer
    x = 111.79

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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.