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Finding the Fourth Proportional to 75.53, 104.49 and 72.80

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Solution

The fourth proportional to 75.53, 104.49 and 72.80 is: 100.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.53 : 104.49 = 72.80 : x
  2. Step 2: Convert to fraction form
    75.53/104.49 = 72.80/x
  3. Step 3: Cross multiply
    75.53x = 104.49 × 72.80
  4. Step 4: Simplify right side
    75.53x = 7,606.74
  5. Step 5: Solve for x
    x = 7,606.74/75.53
  6. Step 6: Final answer
    x = 100.71

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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.