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Finding the Fourth Proportional to 84.80, 116.50 and 79.40

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Solution

The fourth proportional to 84.80, 116.50 and 79.40 is: 109.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.80 : 116.50 = 79.40 : x
  2. Step 2: Convert to fraction form
    84.80/116.50 = 79.40/x
  3. Step 3: Cross multiply
    84.80x = 116.50 × 79.40
  4. Step 4: Simplify right side
    84.80x = 9,250.10
  5. Step 5: Solve for x
    x = 9,250.10/84.80
  6. Step 6: Final answer
    x = 109.08

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.