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Finding the Fourth Proportional to 69.02, 103.39 and 53.75

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Solution

The fourth proportional to 69.02, 103.39 and 53.75 is: 80.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.02 : 103.39 = 53.75 : x
  2. Step 2: Convert to fraction form
    69.02/103.39 = 53.75/x
  3. Step 3: Cross multiply
    69.02x = 103.39 × 53.75
  4. Step 4: Simplify right side
    69.02x = 5,557.21
  5. Step 5: Solve for x
    x = 5,557.21/69.02
  6. Step 6: Final answer
    x = 80.52

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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.