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Finding the Fourth Proportional to 399.68, 599.74 and 217.06

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Solution

The fourth proportional to 399.68, 599.74 and 217.06 is: 325.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.68 : 599.74 = 217.06 : x
  2. Step 2: Convert to fraction form
    399.68/599.74 = 217.06/x
  3. Step 3: Cross multiply
    399.68x = 599.74 × 217.06
  4. Step 4: Simplify right side
    399.68x = 130,179.56
  5. Step 5: Solve for x
    x = 130,179.56/399.68
  6. Step 6: Final answer
    x = 325.71

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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.