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Finding the Fourth Proportional to 77.91, 107.00 and 72.29

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Solution

The fourth proportional to 77.91, 107.00 and 72.29 is: 99.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.91 : 107.00 = 72.29 : x
  2. Step 2: Convert to fraction form
    77.91/107.00 = 72.29/x
  3. Step 3: Cross multiply
    77.91x = 107.00 × 72.29
  4. Step 4: Simplify right side
    77.91x = 7,735.00
  5. Step 5: Solve for x
    x = 7,735.00/77.91
  6. Step 6: Final answer
    x = 99.28

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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.