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Finding the Fourth Proportional to 84.83, 117.09 and 55.72

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Solution

The fourth proportional to 84.83, 117.09 and 55.72 is: 76.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.83 : 117.09 = 55.72 : x
  2. Step 2: Convert to fraction form
    84.83/117.09 = 55.72/x
  3. Step 3: Cross multiply
    84.83x = 117.09 × 55.72
  4. Step 4: Simplify right side
    84.83x = 6,524.25
  5. Step 5: Solve for x
    x = 6,524.25/84.83
  6. Step 6: Final answer
    x = 76.91

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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.