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Finding the Fourth Proportional to 399.09, 599.11 and 317.99

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Solution

The fourth proportional to 399.09, 599.11 and 317.99 is: 477.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.09 : 599.11 = 317.99 : x
  2. Step 2: Convert to fraction form
    399.09/599.11 = 317.99/x
  3. Step 3: Cross multiply
    399.09x = 599.11 × 317.99
  4. Step 4: Simplify right side
    399.09x = 190,506.40
  5. Step 5: Solve for x
    x = 190,506.40/399.09
  6. Step 6: Final answer
    x = 477.35

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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.