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Finding the Fourth Proportional to 76.27, 114.41 and 28.21

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Solution

The fourth proportional to 76.27, 114.41 and 28.21 is: 42.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.27 : 114.41 = 28.21 : x
  2. Step 2: Convert to fraction form
    76.27/114.41 = 28.21/x
  3. Step 3: Cross multiply
    76.27x = 114.41 × 28.21
  4. Step 4: Simplify right side
    76.27x = 3,227.51
  5. Step 5: Solve for x
    x = 3,227.51/76.27
  6. Step 6: Final answer
    x = 42.32

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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.