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Finding the Fourth Proportional to 399.16, 598.20 and 216.51

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Solution

The fourth proportional to 399.16, 598.20 and 216.51 is: 324.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.16 : 598.20 = 216.51 : x
  2. Step 2: Convert to fraction form
    399.16/598.20 = 216.51/x
  3. Step 3: Cross multiply
    399.16x = 598.20 × 216.51
  4. Step 4: Simplify right side
    399.16x = 129,516.28
  5. Step 5: Solve for x
    x = 129,516.28/399.16
  6. Step 6: Final answer
    x = 324.47

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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.