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Finding the Fourth Proportional to 69.40, 103.55 and 68.95

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Solution

The fourth proportional to 69.40, 103.55 and 68.95 is: 102.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.40 : 103.55 = 68.95 : x
  2. Step 2: Convert to fraction form
    69.40/103.55 = 68.95/x
  3. Step 3: Cross multiply
    69.40x = 103.55 × 68.95
  4. Step 4: Simplify right side
    69.40x = 7,139.77
  5. Step 5: Solve for x
    x = 7,139.77/69.40
  6. Step 6: Final answer
    x = 102.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.