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Finding the Fourth Proportional to 90.85, 136.30 and 36.75

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Solution

The fourth proportional to 90.85, 136.30 and 36.75 is: 55.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.85 : 136.30 = 36.75 : x
  2. Step 2: Convert to fraction form
    90.85/136.30 = 36.75/x
  3. Step 3: Cross multiply
    90.85x = 136.30 × 36.75
  4. Step 4: Simplify right side
    90.85x = 5,009.03
  5. Step 5: Solve for x
    x = 5,009.03/90.85
  6. Step 6: Final answer
    x = 55.14

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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.