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Finding the Fourth Proportional to 77.36, 106.40 and 72.92

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Solution

The fourth proportional to 77.36, 106.40 and 72.92 is: 100.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.36 : 106.40 = 72.92 : x
  2. Step 2: Convert to fraction form
    77.36/106.40 = 72.92/x
  3. Step 3: Cross multiply
    77.36x = 106.40 × 72.92
  4. Step 4: Simplify right side
    77.36x = 7,757.79
  5. Step 5: Solve for x
    x = 7,757.79/77.36
  6. Step 6: Final answer
    x = 100.29

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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.