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Finding the Fourth Proportional to 72.36, 108.39 and 49.15

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Solution

The fourth proportional to 72.36, 108.39 and 49.15 is: 73.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.36 : 108.39 = 49.15 : x
  2. Step 2: Convert to fraction form
    72.36/108.39 = 49.15/x
  3. Step 3: Cross multiply
    72.36x = 108.39 × 49.15
  4. Step 4: Simplify right side
    72.36x = 5,327.37
  5. Step 5: Solve for x
    x = 5,327.37/72.36
  6. Step 6: Final answer
    x = 73.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.