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Finding the Fourth Proportional to 82.07, 113.36 and 72.24

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Solution

The fourth proportional to 82.07, 113.36 and 72.24 is: 99.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.07 : 113.36 = 72.24 : x
  2. Step 2: Convert to fraction form
    82.07/113.36 = 72.24/x
  3. Step 3: Cross multiply
    82.07x = 113.36 × 72.24
  4. Step 4: Simplify right side
    82.07x = 8,189.03
  5. Step 5: Solve for x
    x = 8,189.03/82.07
  6. Step 6: Final answer
    x = 99.78

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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.