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Finding the Fourth Proportional to 90.80, 136.02 and 45.09

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Solution

The fourth proportional to 90.80, 136.02 and 45.09 is: 67.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.80 : 136.02 = 45.09 : x
  2. Step 2: Convert to fraction form
    90.80/136.02 = 45.09/x
  3. Step 3: Cross multiply
    90.80x = 136.02 × 45.09
  4. Step 4: Simplify right side
    90.80x = 6,133.14
  5. Step 5: Solve for x
    x = 6,133.14/90.80
  6. Step 6: Final answer
    x = 67.55

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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.