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Finding the Fourth Proportional to 79.48, 109.09 and 72.53

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Solution

The fourth proportional to 79.48, 109.09 and 72.53 is: 99.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.48 : 109.09 = 72.53 : x
  2. Step 2: Convert to fraction form
    79.48/109.09 = 72.53/x
  3. Step 3: Cross multiply
    79.48x = 109.09 × 72.53
  4. Step 4: Simplify right side
    79.48x = 7,912.25
  5. Step 5: Solve for x
    x = 7,912.25/79.48
  6. Step 6: Final answer
    x = 99.55

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.