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Finding the Fourth Proportional to 398.92, 598.38 and 216.68

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Solution

The fourth proportional to 398.92, 598.38 and 216.68 is: 325.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.92 : 598.38 = 216.68 : x
  2. Step 2: Convert to fraction form
    398.92/598.38 = 216.68/x
  3. Step 3: Cross multiply
    398.92x = 598.38 × 216.68
  4. Step 4: Simplify right side
    398.92x = 129,656.98
  5. Step 5: Solve for x
    x = 129,656.98/398.92
  6. Step 6: Final answer
    x = 325.02

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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.