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Finding the Fourth Proportional to 90.99, 136.41 and 68.12

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Solution

The fourth proportional to 90.99, 136.41 and 68.12 is: 102.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.99 : 136.41 = 68.12 : x
  2. Step 2: Convert to fraction form
    90.99/136.41 = 68.12/x
  3. Step 3: Cross multiply
    90.99x = 136.41 × 68.12
  4. Step 4: Simplify right side
    90.99x = 9,291.57
  5. Step 5: Solve for x
    x = 9,291.57/90.99
  6. Step 6: Final answer
    x = 102.12

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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.