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Finding the Fourth Proportional to 84.33, 125.88 and 72.72

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Solution

The fourth proportional to 84.33, 125.88 and 72.72 is: 108.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.33 : 125.88 = 72.72 : x
  2. Step 2: Convert to fraction form
    84.33/125.88 = 72.72/x
  3. Step 3: Cross multiply
    84.33x = 125.88 × 72.72
  4. Step 4: Simplify right side
    84.33x = 9,153.99
  5. Step 5: Solve for x
    x = 9,153.99/84.33
  6. Step 6: Final answer
    x = 108.55

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Why These Related Problems?

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