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Finding the Fourth Proportional to 90.85, 125.51 and 72.41

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Solution

The fourth proportional to 90.85, 125.51 and 72.41 is: 100.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.85 : 125.51 = 72.41 : x
  2. Step 2: Convert to fraction form
    90.85/125.51 = 72.41/x
  3. Step 3: Cross multiply
    90.85x = 125.51 × 72.41
  4. Step 4: Simplify right side
    90.85x = 9,087.54
  5. Step 5: Solve for x
    x = 9,087.54/90.85
  6. Step 6: Final answer
    x = 100.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.