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Finding the Fourth Proportional to 91.75, 137.69 and 70.11

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Solution

The fourth proportional to 91.75, 137.69 and 70.11 is: 105.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.75 : 137.69 = 70.11 : x
  2. Step 2: Convert to fraction form
    91.75/137.69 = 70.11/x
  3. Step 3: Cross multiply
    91.75x = 137.69 × 70.11
  4. Step 4: Simplify right side
    91.75x = 9,653.45
  5. Step 5: Solve for x
    x = 9,653.45/91.75
  6. Step 6: Final answer
    x = 105.21

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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.