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Finding the Fourth Proportional to 75.75, 113.45 and 45.28

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Solution

The fourth proportional to 75.75, 113.45 and 45.28 is: 67.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.75 : 113.45 = 45.28 : x
  2. Step 2: Convert to fraction form
    75.75/113.45 = 45.28/x
  3. Step 3: Cross multiply
    75.75x = 113.45 × 45.28
  4. Step 4: Simplify right side
    75.75x = 5,136.79
  5. Step 5: Solve for x
    x = 5,136.79/75.75
  6. Step 6: Final answer
    x = 67.81

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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.