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Finding the Fourth Proportional to 69.77, 104.66 and 21.71

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Solution

The fourth proportional to 69.77, 104.66 and 21.71 is: 32.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.77 : 104.66 = 21.71 : x
  2. Step 2: Convert to fraction form
    69.77/104.66 = 21.71/x
  3. Step 3: Cross multiply
    69.77x = 104.66 × 21.71
  4. Step 4: Simplify right side
    69.77x = 2,272.06
  5. Step 5: Solve for x
    x = 2,272.06/69.77
  6. Step 6: Final answer
    x = 32.57

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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.