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Finding the Fourth Proportional to 72.44, 99.97 and 39.70

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Solution

The fourth proportional to 72.44, 99.97 and 39.70 is: 54.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.44 : 99.97 = 39.70 : x
  2. Step 2: Convert to fraction form
    72.44/99.97 = 39.70/x
  3. Step 3: Cross multiply
    72.44x = 99.97 × 39.70
  4. Step 4: Simplify right side
    72.44x = 3,968.31
  5. Step 5: Solve for x
    x = 3,968.31/72.44
  6. Step 6: Final answer
    x = 54.78

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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.