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Finding the Fourth Proportional to 105.25, 157.91 and 57.13

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Solution

The fourth proportional to 105.25, 157.91 and 57.13 is: 85.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.25 : 157.91 = 57.13 : x
  2. Step 2: Convert to fraction form
    105.25/157.91 = 57.13/x
  3. Step 3: Cross multiply
    105.25x = 157.91 × 57.13
  4. Step 4: Simplify right side
    105.25x = 9,021.40
  5. Step 5: Solve for x
    x = 9,021.40/105.25
  6. Step 6: Final answer
    x = 85.71

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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.