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Finding the Fourth Proportional to 84.40, 116.38 and 69.80

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Solution

The fourth proportional to 84.40, 116.38 and 69.80 is: 96.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.40 : 116.38 = 69.80 : x
  2. Step 2: Convert to fraction form
    84.40/116.38 = 69.80/x
  3. Step 3: Cross multiply
    84.40x = 116.38 × 69.80
  4. Step 4: Simplify right side
    84.40x = 8,123.32
  5. Step 5: Solve for x
    x = 8,123.32/84.40
  6. Step 6: Final answer
    x = 96.25

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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.