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Finding the Fourth Proportional to 69.36, 103.60 and 57.12

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Solution

The fourth proportional to 69.36, 103.60 and 57.12 is: 85.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.36 : 103.60 = 57.12 : x
  2. Step 2: Convert to fraction form
    69.36/103.60 = 57.12/x
  3. Step 3: Cross multiply
    69.36x = 103.60 × 57.12
  4. Step 4: Simplify right side
    69.36x = 5,917.63
  5. Step 5: Solve for x
    x = 5,917.63/69.36
  6. Step 6: Final answer
    x = 85.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.