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Finding the Fourth Proportional to 808.80, 1,213.02 and 392.32

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Solution

The fourth proportional to 808.80, 1,213.02 and 392.32 is: 588.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.80 : 1,213.02 = 392.32 : x
  2. Step 2: Convert to fraction form
    808.80/1,213.02 = 392.32/x
  3. Step 3: Cross multiply
    808.80x = 1,213.02 × 392.32
  4. Step 4: Simplify right side
    808.80x = 475,888.97
  5. Step 5: Solve for x
    x = 475,888.97/808.80
  6. Step 6: Final answer
    x = 588.39

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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.