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Finding the Fourth Proportional to 72.78, 100.26 and 69.12

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Solution

The fourth proportional to 72.78, 100.26 and 69.12 is: 95.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.78 : 100.26 = 69.12 : x
  2. Step 2: Convert to fraction form
    72.78/100.26 = 69.12/x
  3. Step 3: Cross multiply
    72.78x = 100.26 × 69.12
  4. Step 4: Simplify right side
    72.78x = 6,929.97
  5. Step 5: Solve for x
    x = 6,929.97/72.78
  6. Step 6: Final answer
    x = 95.22

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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.