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Finding the Fourth Proportional to 90.66, 135.87 and 36.48

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Solution

The fourth proportional to 90.66, 135.87 and 36.48 is: 54.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.66 : 135.87 = 36.48 : x
  2. Step 2: Convert to fraction form
    90.66/135.87 = 36.48/x
  3. Step 3: Cross multiply
    90.66x = 135.87 × 36.48
  4. Step 4: Simplify right side
    90.66x = 4,956.54
  5. Step 5: Solve for x
    x = 4,956.54/90.66
  6. Step 6: Final answer
    x = 54.67

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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.