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Finding the Fourth Proportional to 809.48, 1,213.90 and 289.38

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Solution

The fourth proportional to 809.48, 1,213.90 and 289.38 is: 433.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.48 : 1,213.90 = 289.38 : x
  2. Step 2: Convert to fraction form
    809.48/1,213.90 = 289.38/x
  3. Step 3: Cross multiply
    809.48x = 1,213.90 × 289.38
  4. Step 4: Simplify right side
    809.48x = 351,278.38
  5. Step 5: Solve for x
    x = 351,278.38/809.48
  6. Step 6: Final answer
    x = 433.96

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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.