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Finding the Fourth Proportional to 69.84, 104.08 and 68.48

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Solution

The fourth proportional to 69.84, 104.08 and 68.48 is: 102.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.84 : 104.08 = 68.48 : x
  2. Step 2: Convert to fraction form
    69.84/104.08 = 68.48/x
  3. Step 3: Cross multiply
    69.84x = 104.08 × 68.48
  4. Step 4: Simplify right side
    69.84x = 7,127.40
  5. Step 5: Solve for x
    x = 7,127.40/69.84
  6. Step 6: Final answer
    x = 102.05

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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.