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Finding the Fourth Proportional to 84.79, 117.16 and 79.65

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Solution

The fourth proportional to 84.79, 117.16 and 79.65 is: 110.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.79 : 117.16 = 79.65 : x
  2. Step 2: Convert to fraction form
    84.79/117.16 = 79.65/x
  3. Step 3: Cross multiply
    84.79x = 117.16 × 79.65
  4. Step 4: Simplify right side
    84.79x = 9,331.40
  5. Step 5: Solve for x
    x = 9,331.40/84.79
  6. Step 6: Final answer
    x = 110.05

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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.