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Finding the Fourth Proportional to 91.69, 137.75 and 89.75

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Solution

The fourth proportional to 91.69, 137.75 and 89.75 is: 134.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.69 : 137.75 = 89.75 : x
  2. Step 2: Convert to fraction form
    91.69/137.75 = 89.75/x
  3. Step 3: Cross multiply
    91.69x = 137.75 × 89.75
  4. Step 4: Simplify right side
    91.69x = 12,362.96
  5. Step 5: Solve for x
    x = 12,362.96/91.69
  6. Step 6: Final answer
    x = 134.84

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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.