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Finding the Fourth Proportional to 90.96, 136.52 and 68.19

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Solution

The fourth proportional to 90.96, 136.52 and 68.19 is: 102.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.96 : 136.52 = 68.19 : x
  2. Step 2: Convert to fraction form
    90.96/136.52 = 68.19/x
  3. Step 3: Cross multiply
    90.96x = 136.52 × 68.19
  4. Step 4: Simplify right side
    90.96x = 9,308.96
  5. Step 5: Solve for x
    x = 9,308.96/90.96
  6. Step 6: Final answer
    x = 102.34

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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.