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Finding the Fourth Proportional to 84.77, 117.52 and 80.15

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Solution

The fourth proportional to 84.77, 117.52 and 80.15 is: 111.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.77 : 117.52 = 80.15 : x
  2. Step 2: Convert to fraction form
    84.77/117.52 = 80.15/x
  3. Step 3: Cross multiply
    84.77x = 117.52 × 80.15
  4. Step 4: Simplify right side
    84.77x = 9,419.32
  5. Step 5: Solve for x
    x = 9,419.32/84.77
  6. Step 6: Final answer
    x = 111.11

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.