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Finding the Fourth Proportional to 809.56, 1,213.46 and 315.84

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Solution

The fourth proportional to 809.56, 1,213.46 and 315.84 is: 473.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.56 : 1,213.46 = 315.84 : x
  2. Step 2: Convert to fraction form
    809.56/1,213.46 = 315.84/x
  3. Step 3: Cross multiply
    809.56x = 1,213.46 × 315.84
  4. Step 4: Simplify right side
    809.56x = 383,259.21
  5. Step 5: Solve for x
    x = 383,259.21/809.56
  6. Step 6: Final answer
    x = 473.42

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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.