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Finding the Fourth Proportional to 91.62, 137.25 and 69.99

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Solution

The fourth proportional to 91.62, 137.25 and 69.99 is: 104.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.62 : 137.25 = 69.99 : x
  2. Step 2: Convert to fraction form
    91.62/137.25 = 69.99/x
  3. Step 3: Cross multiply
    91.62x = 137.25 × 69.99
  4. Step 4: Simplify right side
    91.62x = 9,606.13
  5. Step 5: Solve for x
    x = 9,606.13/91.62
  6. Step 6: Final answer
    x = 104.85

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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.