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Finding the Fourth Proportional to 72.49, 99.81 and 57.71

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Solution

The fourth proportional to 72.49, 99.81 and 57.71 is: 79.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.49 : 99.81 = 57.71 : x
  2. Step 2: Convert to fraction form
    72.49/99.81 = 57.71/x
  3. Step 3: Cross multiply
    72.49x = 99.81 × 57.71
  4. Step 4: Simplify right side
    72.49x = 5,759.54
  5. Step 5: Solve for x
    x = 5,759.54/72.49
  6. Step 6: Final answer
    x = 79.45

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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.