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Finding the Fourth Proportional to 809.01, 1,213.56 and 261.36

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Solution

The fourth proportional to 809.01, 1,213.56 and 261.36 is: 392.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.01 : 1,213.56 = 261.36 : x
  2. Step 2: Convert to fraction form
    809.01/1,213.56 = 261.36/x
  3. Step 3: Cross multiply
    809.01x = 1,213.56 × 261.36
  4. Step 4: Simplify right side
    809.01x = 317,176.04
  5. Step 5: Solve for x
    x = 317,176.04/809.01
  6. Step 6: Final answer
    x = 392.05

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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.