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Finding the Fourth Proportional to 90.55, 125.63 and 86.09

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Solution

The fourth proportional to 90.55, 125.63 and 86.09 is: 119.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.55 : 125.63 = 86.09 : x
  2. Step 2: Convert to fraction form
    90.55/125.63 = 86.09/x
  3. Step 3: Cross multiply
    90.55x = 125.63 × 86.09
  4. Step 4: Simplify right side
    90.55x = 10,815.49
  5. Step 5: Solve for x
    x = 10,815.49/90.55
  6. Step 6: Final answer
    x = 119.44

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.