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Finding the Fourth Proportional to 809.47, 1,214.44 and 398.73

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Solution

The fourth proportional to 809.47, 1,214.44 and 398.73 is: 598.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.47 : 1,214.44 = 398.73 : x
  2. Step 2: Convert to fraction form
    809.47/1,214.44 = 398.73/x
  3. Step 3: Cross multiply
    809.47x = 1,214.44 × 398.73
  4. Step 4: Simplify right side
    809.47x = 484,233.66
  5. Step 5: Solve for x
    x = 484,233.66/809.47
  6. Step 6: Final answer
    x = 598.21

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Double scale
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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.