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Finding the Fourth Proportional to 289.34, 398.31 and 223.72

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Solution

The fourth proportional to 289.34, 398.31 and 223.72 is: 307.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.34 : 398.31 = 223.72 : x
  2. Step 2: Convert to fraction form
    289.34/398.31 = 223.72/x
  3. Step 3: Cross multiply
    289.34x = 398.31 × 223.72
  4. Step 4: Simplify right side
    289.34x = 89,109.91
  5. Step 5: Solve for x
    x = 89,109.91/289.34
  6. Step 6: Final answer
    x = 307.98

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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.