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Finding the Fourth Proportional to 90.22, 135.34 and 53.69

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Solution

The fourth proportional to 90.22, 135.34 and 53.69 is: 80.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.22 : 135.34 = 53.69 : x
  2. Step 2: Convert to fraction form
    90.22/135.34 = 53.69/x
  3. Step 3: Cross multiply
    90.22x = 135.34 × 53.69
  4. Step 4: Simplify right side
    90.22x = 7,265.90
  5. Step 5: Solve for x
    x = 7,265.90/90.22
  6. Step 6: Final answer
    x = 80.54

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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.