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Finding the Fourth Proportional to 804.13, 1,205.79 and 392.65

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Solution

The fourth proportional to 804.13, 1,205.79 and 392.65 is: 588.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.13 : 1,205.79 = 392.65 : x
  2. Step 2: Convert to fraction form
    804.13/1,205.79 = 392.65/x
  3. Step 3: Cross multiply
    804.13x = 1,205.79 × 392.65
  4. Step 4: Simplify right side
    804.13x = 473,453.44
  5. Step 5: Solve for x
    x = 473,453.44/804.13
  6. Step 6: Final answer
    x = 588.78

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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.