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Finding the Fourth Proportional to 289.37, 433.65 and 217.28

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Solution

The fourth proportional to 289.37, 433.65 and 217.28 is: 325.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.37 : 433.65 = 217.28 : x
  2. Step 2: Convert to fraction form
    289.37/433.65 = 217.28/x
  3. Step 3: Cross multiply
    289.37x = 433.65 × 217.28
  4. Step 4: Simplify right side
    289.37x = 94,223.47
  5. Step 5: Solve for x
    x = 94,223.47/289.37
  6. Step 6: Final answer
    x = 325.62

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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.