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Finding the Fourth Proportional to 69.81, 104.66 and 26.45

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Solution

The fourth proportional to 69.81, 104.66 and 26.45 is: 39.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.81 : 104.66 = 26.45 : x
  2. Step 2: Convert to fraction form
    69.81/104.66 = 26.45/x
  3. Step 3: Cross multiply
    69.81x = 104.66 × 26.45
  4. Step 4: Simplify right side
    69.81x = 2,768.26
  5. Step 5: Solve for x
    x = 2,768.26/69.81
  6. Step 6: Final answer
    x = 39.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.