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Finding the Fourth Proportional to 399.15, 598.96 and 216.68

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Solution

The fourth proportional to 399.15, 598.96 and 216.68 is: 325.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.15 : 598.96 = 216.68 : x
  2. Step 2: Convert to fraction form
    399.15/598.96 = 216.68/x
  3. Step 3: Cross multiply
    399.15x = 598.96 × 216.68
  4. Step 4: Simplify right side
    399.15x = 129,779.12
  5. Step 5: Solve for x
    x = 129,779.12/399.15
  6. Step 6: Final answer
    x = 325.14

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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.