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Finding the Fourth Proportional to 399.92, 599.78 and 111.38

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Solution

The fourth proportional to 399.92, 599.78 and 111.38 is: 167.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.92 : 599.78 = 111.38 : x
  2. Step 2: Convert to fraction form
    399.92/599.78 = 111.38/x
  3. Step 3: Cross multiply
    399.92x = 599.78 × 111.38
  4. Step 4: Simplify right side
    399.92x = 66,803.50
  5. Step 5: Solve for x
    x = 66,803.50/399.92
  6. Step 6: Final answer
    x = 167.04

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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.