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Finding the Fourth Proportional to 76.22, 113.62 and 74.90

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Solution

The fourth proportional to 76.22, 113.62 and 74.90 is: 111.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.22 : 113.62 = 74.90 : x
  2. Step 2: Convert to fraction form
    76.22/113.62 = 74.90/x
  3. Step 3: Cross multiply
    76.22x = 113.62 × 74.90
  4. Step 4: Simplify right side
    76.22x = 8,510.14
  5. Step 5: Solve for x
    x = 8,510.14/76.22
  6. Step 6: Final answer
    x = 111.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.