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Finding the Fourth Proportional to 825.04, 1,138.56 and 475.80

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Solution

The fourth proportional to 825.04, 1,138.56 and 475.80 is: 656.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.04 : 1,138.56 = 475.80 : x
  2. Step 2: Convert to fraction form
    825.04/1,138.56 = 475.80/x
  3. Step 3: Cross multiply
    825.04x = 1,138.56 × 475.80
  4. Step 4: Simplify right side
    825.04x = 541,726.85
  5. Step 5: Solve for x
    x = 541,726.85/825.04
  6. Step 6: Final answer
    x = 656.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.