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Finding the Fourth Proportional to 69.94, 96.44 and 66.09

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Solution

The fourth proportional to 69.94, 96.44 and 66.09 is: 91.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.94 : 96.44 = 66.09 : x
  2. Step 2: Convert to fraction form
    69.94/96.44 = 66.09/x
  3. Step 3: Cross multiply
    69.94x = 96.44 × 66.09
  4. Step 4: Simplify right side
    69.94x = 6,373.75
  5. Step 5: Solve for x
    x = 6,373.75/69.94
  6. Step 6: Final answer
    x = 91.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.