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Finding the Fourth Proportional to 90.88, 136.44 and 85.23

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Solution

The fourth proportional to 90.88, 136.44 and 85.23 is: 127.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.88 : 136.44 = 85.23 : x
  2. Step 2: Convert to fraction form
    90.88/136.44 = 85.23/x
  3. Step 3: Cross multiply
    90.88x = 136.44 × 85.23
  4. Step 4: Simplify right side
    90.88x = 11,628.78
  5. Step 5: Solve for x
    x = 11,628.78/90.88
  6. Step 6: Final answer
    x = 127.96

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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.