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Finding the Fourth Proportional to 289.09, 397.97 and 223.47

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Solution

The fourth proportional to 289.09, 397.97 and 223.47 is: 307.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.09 : 397.97 = 223.47 : x
  2. Step 2: Convert to fraction form
    289.09/397.97 = 223.47/x
  3. Step 3: Cross multiply
    289.09x = 397.97 × 223.47
  4. Step 4: Simplify right side
    289.09x = 88,933.24
  5. Step 5: Solve for x
    x = 88,933.24/289.09
  6. Step 6: Final answer
    x = 307.63

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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.