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Finding the Fourth Proportional to 74.25, 102.40 and 57.85

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Solution

The fourth proportional to 74.25, 102.40 and 57.85 is: 79.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.25 : 102.40 = 57.85 : x
  2. Step 2: Convert to fraction form
    74.25/102.40 = 57.85/x
  3. Step 3: Cross multiply
    74.25x = 102.40 × 57.85
  4. Step 4: Simplify right side
    74.25x = 5,923.44
  5. Step 5: Solve for x
    x = 5,923.44/74.25
  6. Step 6: Final answer
    x = 79.78

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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.