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Finding the Fourth Proportional to 75.71, 113.78 and 74.11

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Solution

The fourth proportional to 75.71, 113.78 and 74.11 is: 111.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.71 : 113.78 = 74.11 : x
  2. Step 2: Convert to fraction form
    75.71/113.78 = 74.11/x
  3. Step 3: Cross multiply
    75.71x = 113.78 × 74.11
  4. Step 4: Simplify right side
    75.71x = 8,432.14
  5. Step 5: Solve for x
    x = 8,432.14/75.71
  6. Step 6: Final answer
    x = 111.38

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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.