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Finding the Fourth Proportional to 90.21, 135.29 and 36.11

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Solution

The fourth proportional to 90.21, 135.29 and 36.11 is: 54.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.21 : 135.29 = 36.11 : x
  2. Step 2: Convert to fraction form
    90.21/135.29 = 36.11/x
  3. Step 3: Cross multiply
    90.21x = 135.29 × 36.11
  4. Step 4: Simplify right side
    90.21x = 4,884.46
  5. Step 5: Solve for x
    x = 4,884.46/90.21
  6. Step 6: Final answer
    x = 54.15

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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.