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Finding the Fourth Proportional to 886.80, 1,330.20 and 331.50

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Solution

The fourth proportional to 886.80, 1,330.20 and 331.50 is: 497.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.80 : 1,330.20 = 331.50 : x
  2. Step 2: Convert to fraction form
    886.80/1,330.20 = 331.50/x
  3. Step 3: Cross multiply
    886.80x = 1,330.20 × 331.50
  4. Step 4: Simplify right side
    886.80x = 440,961.30
  5. Step 5: Solve for x
    x = 440,961.30/886.80
  6. Step 6: Final answer
    x = 497.25

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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.