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Finding the Fourth Proportional to 399.96, 599.76 and 139.92

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Solution

The fourth proportional to 399.96, 599.76 and 139.92 is: 209.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.96 : 599.76 = 139.92 : x
  2. Step 2: Convert to fraction form
    399.96/599.76 = 139.92/x
  3. Step 3: Cross multiply
    399.96x = 599.76 × 139.92
  4. Step 4: Simplify right side
    399.96x = 83,918.42
  5. Step 5: Solve for x
    x = 83,918.42/399.96
  6. Step 6: Final answer
    x = 209.82

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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.