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Finding the Fourth Proportional to 91.89, 137.93 and 69.12

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Solution

The fourth proportional to 91.89, 137.93 and 69.12 is: 103.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.89 : 137.93 = 69.12 : x
  2. Step 2: Convert to fraction form
    91.89/137.93 = 69.12/x
  3. Step 3: Cross multiply
    91.89x = 137.93 × 69.12
  4. Step 4: Simplify right side
    91.89x = 9,533.38
  5. Step 5: Solve for x
    x = 9,533.38/91.89
  6. Step 6: Final answer
    x = 103.75

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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.