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Finding the Fourth Proportional to 84.81, 127.08 and 77.79

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Solution

The fourth proportional to 84.81, 127.08 and 77.79 is: 116.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.81 : 127.08 = 77.79 : x
  2. Step 2: Convert to fraction form
    84.81/127.08 = 77.79/x
  3. Step 3: Cross multiply
    84.81x = 127.08 × 77.79
  4. Step 4: Simplify right side
    84.81x = 9,885.55
  5. Step 5: Solve for x
    x = 9,885.55/84.81
  6. Step 6: Final answer
    x = 116.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.