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Finding the Fourth Proportional to 69.49, 103.79 and 69.07

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Solution

The fourth proportional to 69.49, 103.79 and 69.07 is: 103.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.49 : 103.79 = 69.07 : x
  2. Step 2: Convert to fraction form
    69.49/103.79 = 69.07/x
  3. Step 3: Cross multiply
    69.49x = 103.79 × 69.07
  4. Step 4: Simplify right side
    69.49x = 7,168.78
  5. Step 5: Solve for x
    x = 7,168.78/69.49
  6. Step 6: Final answer
    x = 103.16

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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.