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Finding the Fourth Proportional to 70.25, 105.44 and 66.65

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Solution

The fourth proportional to 70.25, 105.44 and 66.65 is: 100.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.25 : 105.44 = 66.65 : x
  2. Step 2: Convert to fraction form
    70.25/105.44 = 66.65/x
  3. Step 3: Cross multiply
    70.25x = 105.44 × 66.65
  4. Step 4: Simplify right side
    70.25x = 7,026.72
  5. Step 5: Solve for x
    x = 7,026.72/70.25
  6. Step 6: Final answer
    x = 100.03

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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.