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Finding the Fourth Proportional to 75.45, 104.65 and 72.86

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Solution

The fourth proportional to 75.45, 104.65 and 72.86 is: 101.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.45 : 104.65 = 72.86 : x
  2. Step 2: Convert to fraction form
    75.45/104.65 = 72.86/x
  3. Step 3: Cross multiply
    75.45x = 104.65 × 72.86
  4. Step 4: Simplify right side
    75.45x = 7,624.80
  5. Step 5: Solve for x
    x = 7,624.80/75.45
  6. Step 6: Final answer
    x = 101.06

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.