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Finding the Fourth Proportional to 71.54, 107.28 and 20.16

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Solution

The fourth proportional to 71.54, 107.28 and 20.16 is: 30.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.54 : 107.28 = 20.16 : x
  2. Step 2: Convert to fraction form
    71.54/107.28 = 20.16/x
  3. Step 3: Cross multiply
    71.54x = 107.28 × 20.16
  4. Step 4: Simplify right side
    71.54x = 2,163.09
  5. Step 5: Solve for x
    x = 2,163.09/71.54
  6. Step 6: Final answer
    x = 30.24

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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.