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Finding the Fourth Proportional to 84.71, 127.05 and 55.78

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Solution

The fourth proportional to 84.71, 127.05 and 55.78 is: 83.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.71 : 127.05 = 55.78 : x
  2. Step 2: Convert to fraction form
    84.71/127.05 = 55.78/x
  3. Step 3: Cross multiply
    84.71x = 127.05 × 55.78
  4. Step 4: Simplify right side
    84.71x = 7,086.85
  5. Step 5: Solve for x
    x = 7,086.85/84.71
  6. Step 6: Final answer
    x = 83.66

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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.