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Finding the Fourth Proportional to 75.50, 113.37 and 74.42

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Solution

The fourth proportional to 75.50, 113.37 and 74.42 is: 111.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.50 : 113.37 = 74.42 : x
  2. Step 2: Convert to fraction form
    75.50/113.37 = 74.42/x
  3. Step 3: Cross multiply
    75.50x = 113.37 × 74.42
  4. Step 4: Simplify right side
    75.50x = 8,437.28
  5. Step 5: Solve for x
    x = 8,437.28/75.50
  6. Step 6: Final answer
    x = 111.75

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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.