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Finding the Fourth Proportional to 76.28, 104.39 and 75.47

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Solution

The fourth proportional to 76.28, 104.39 and 75.47 is: 103.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.28 : 104.39 = 75.47 : x
  2. Step 2: Convert to fraction form
    76.28/104.39 = 75.47/x
  3. Step 3: Cross multiply
    76.28x = 104.39 × 75.47
  4. Step 4: Simplify right side
    76.28x = 7,877.70
  5. Step 5: Solve for x
    x = 7,877.70/76.28
  6. Step 6: Final answer
    x = 103.28

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.