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Finding the Fourth Proportional to 289.67, 399.53 and 216.23

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Solution

The fourth proportional to 289.67, 399.53 and 216.23 is: 298.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.67 : 399.53 = 216.23 : x
  2. Step 2: Convert to fraction form
    289.67/399.53 = 216.23/x
  3. Step 3: Cross multiply
    289.67x = 399.53 × 216.23
  4. Step 4: Simplify right side
    289.67x = 86,388.91
  5. Step 5: Solve for x
    x = 86,388.91/289.67
  6. Step 6: Final answer
    x = 298.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.