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Finding the Fourth Proportional to 289.44, 434.31 and 221.40

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Solution

The fourth proportional to 289.44, 434.31 and 221.40 is: 332.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.44 : 434.31 = 221.40 : x
  2. Step 2: Convert to fraction form
    289.44/434.31 = 221.40/x
  3. Step 3: Cross multiply
    289.44x = 434.31 × 221.40
  4. Step 4: Simplify right side
    289.44x = 96,156.23
  5. Step 5: Solve for x
    x = 96,156.23/289.44
  6. Step 6: Final answer
    x = 332.21

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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.