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Finding the Fourth Proportional to 76.14, 104.88 and 72.81

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Solution

The fourth proportional to 76.14, 104.88 and 72.81 is: 100.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.14 : 104.88 = 72.81 : x
  2. Step 2: Convert to fraction form
    76.14/104.88 = 72.81/x
  3. Step 3: Cross multiply
    76.14x = 104.88 × 72.81
  4. Step 4: Simplify right side
    76.14x = 7,636.31
  5. Step 5: Solve for x
    x = 7,636.31/76.14
  6. Step 6: Final answer
    x = 100.29

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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.