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Finding the Fourth Proportional to 880.80, 1,321.16 and 231.60

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Solution

The fourth proportional to 880.80, 1,321.16 and 231.60 is: 347.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.80 : 1,321.16 = 231.60 : x
  2. Step 2: Convert to fraction form
    880.80/1,321.16 = 231.60/x
  3. Step 3: Cross multiply
    880.80x = 1,321.16 × 231.60
  4. Step 4: Simplify right side
    880.80x = 305,980.66
  5. Step 5: Solve for x
    x = 305,980.66/880.80
  6. Step 6: Final answer
    x = 347.39

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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.