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Finding the Fourth Proportional to 84.24, 125.76 and 72

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Solution

The fourth proportional to 84.24, 125.76 and 72 is: 107.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.24 : 125.76 = 72 : x
  2. Step 2: Convert to fraction form
    84.24/125.76 = 72/x
  3. Step 3: Cross multiply
    84.24x = 125.76 × 72
  4. Step 4: Simplify right side
    84.24x = 9,054.72
  5. Step 5: Solve for x
    x = 9,054.72/84.24
  6. Step 6: Final answer
    x = 107.49

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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.