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Finding the Fourth Proportional to 90.90, 136.53 and 80.94

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Solution

The fourth proportional to 90.90, 136.53 and 80.94 is: 121.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.90 : 136.53 = 80.94 : x
  2. Step 2: Convert to fraction form
    90.90/136.53 = 80.94/x
  3. Step 3: Cross multiply
    90.90x = 136.53 × 80.94
  4. Step 4: Simplify right side
    90.90x = 11,050.74
  5. Step 5: Solve for x
    x = 11,050.74/90.90
  6. Step 6: Final answer
    x = 121.57

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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.