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Finding the Fourth Proportional to 84.87, 117.81 and 79.47

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Solution

The fourth proportional to 84.87, 117.81 and 79.47 is: 110.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.87 : 117.81 = 79.47 : x
  2. Step 2: Convert to fraction form
    84.87/117.81 = 79.47/x
  3. Step 3: Cross multiply
    84.87x = 117.81 × 79.47
  4. Step 4: Simplify right side
    84.87x = 9,362.36
  5. Step 5: Solve for x
    x = 9,362.36/84.87
  6. Step 6: Final answer
    x = 110.31

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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.