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Finding the Fourth Proportional to 888.78, 1,333.20 and 311.70

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Solution

The fourth proportional to 888.78, 1,333.20 and 311.70 is: 467.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.78 : 1,333.20 = 311.70 : x
  2. Step 2: Convert to fraction form
    888.78/1,333.20 = 311.70/x
  3. Step 3: Cross multiply
    888.78x = 1,333.20 × 311.70
  4. Step 4: Simplify right side
    888.78x = 415,558.44
  5. Step 5: Solve for x
    x = 415,558.44/888.78
  6. Step 6: Final answer
    x = 467.56

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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.