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Finding the Fourth Proportional to 399.33, 599.33 and 318.69

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Solution

The fourth proportional to 399.33, 599.33 and 318.69 is: 478.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.33 : 599.33 = 318.69 : x
  2. Step 2: Convert to fraction form
    399.33/599.33 = 318.69/x
  3. Step 3: Cross multiply
    399.33x = 599.33 × 318.69
  4. Step 4: Simplify right side
    399.33x = 191,001.27
  5. Step 5: Solve for x
    x = 191,001.27/399.33
  6. Step 6: Final answer
    x = 478.30

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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.