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Finding the Fourth Proportional to 809.47, 1,213.84 and 398.13

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Solution

The fourth proportional to 809.47, 1,213.84 and 398.13 is: 597.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.47 : 1,213.84 = 398.13 : x
  2. Step 2: Convert to fraction form
    809.47/1,213.84 = 398.13/x
  3. Step 3: Cross multiply
    809.47x = 1,213.84 × 398.13
  4. Step 4: Simplify right side
    809.47x = 483,266.12
  5. Step 5: Solve for x
    x = 483,266.12/809.47
  6. Step 6: Final answer
    x = 597.02

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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.