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Finding the Fourth Proportional to 105.36, 157.86 and 57.12

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Solution

The fourth proportional to 105.36, 157.86 and 57.12 is: 85.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.36 : 157.86 = 57.12 : x
  2. Step 2: Convert to fraction form
    105.36/157.86 = 57.12/x
  3. Step 3: Cross multiply
    105.36x = 157.86 × 57.12
  4. Step 4: Simplify right side
    105.36x = 9,016.96
  5. Step 5: Solve for x
    x = 9,016.96/105.36
  6. Step 6: Final answer
    x = 85.58

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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.