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Finding the Fourth Proportional to 825.60, 1,238.10 and 331.80

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Solution

The fourth proportional to 825.60, 1,238.10 and 331.80 is: 497.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.60 : 1,238.10 = 331.80 : x
  2. Step 2: Convert to fraction form
    825.60/1,238.10 = 331.80/x
  3. Step 3: Cross multiply
    825.60x = 1,238.10 × 331.80
  4. Step 4: Simplify right side
    825.60x = 410,801.58
  5. Step 5: Solve for x
    x = 410,801.58/825.60
  6. Step 6: Final answer
    x = 497.58

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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.