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Finding the Fourth Proportional to 84.63, 116.78 and 55.11

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Solution

The fourth proportional to 84.63, 116.78 and 55.11 is: 76.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.63 : 116.78 = 55.11 : x
  2. Step 2: Convert to fraction form
    84.63/116.78 = 55.11/x
  3. Step 3: Cross multiply
    84.63x = 116.78 × 55.11
  4. Step 4: Simplify right side
    84.63x = 6,435.47
  5. Step 5: Solve for x
    x = 6,435.47/84.63
  6. Step 6: Final answer
    x = 76.04

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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.