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Finding the Fourth Proportional to 84.18, 125.61 and 72.12

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Solution

The fourth proportional to 84.18, 125.61 and 72.12 is: 107.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.18 : 125.61 = 72.12 : x
  2. Step 2: Convert to fraction form
    84.18/125.61 = 72.12/x
  3. Step 3: Cross multiply
    84.18x = 125.61 × 72.12
  4. Step 4: Simplify right side
    84.18x = 9,058.99
  5. Step 5: Solve for x
    x = 9,058.99/84.18
  6. Step 6: Final answer
    x = 107.61

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These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.