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Finding the Fourth Proportional to 69.98, 105.50 and 69.21

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Solution

The fourth proportional to 69.98, 105.50 and 69.21 is: 104.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.98 : 105.50 = 69.21 : x
  2. Step 2: Convert to fraction form
    69.98/105.50 = 69.21/x
  3. Step 3: Cross multiply
    69.98x = 105.50 × 69.21
  4. Step 4: Simplify right side
    69.98x = 7,301.83
  5. Step 5: Solve for x
    x = 7,301.83/69.98
  6. Step 6: Final answer
    x = 104.35

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.