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Finding the Fourth Proportional to 289.64, 433.90 and 217.80

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Solution

The fourth proportional to 289.64, 433.90 and 217.80 is: 326.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.64 : 433.90 = 217.80 : x
  2. Step 2: Convert to fraction form
    289.64/433.90 = 217.80/x
  3. Step 3: Cross multiply
    289.64x = 433.90 × 217.80
  4. Step 4: Simplify right side
    289.64x = 94,503.42
  5. Step 5: Solve for x
    x = 94,503.42/289.64
  6. Step 6: Final answer
    x = 326.28

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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.