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Finding the Fourth Proportional to 289.43, 433.73 and 217.20

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Solution

The fourth proportional to 289.43, 433.73 and 217.20 is: 325.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.43 : 433.73 = 217.20 : x
  2. Step 2: Convert to fraction form
    289.43/433.73 = 217.20/x
  3. Step 3: Cross multiply
    289.43x = 433.73 × 217.20
  4. Step 4: Simplify right side
    289.43x = 94,206.70
  5. Step 5: Solve for x
    x = 94,206.70/289.43
  6. Step 6: Final answer
    x = 325.50

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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.