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Finding the Fourth Proportional to 3,326.28, 4,988.97 and 861.12

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Solution

The fourth proportional to 3,326.28, 4,988.97 and 861.12 is: 1,291.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,326.28 : 4,988.97 = 861.12 : x
  2. Step 2: Convert to fraction form
    3,326.28/4,988.97 = 861.12/x
  3. Step 3: Cross multiply
    3,326.28x = 4,988.97 × 861.12
  4. Step 4: Simplify right side
    3,326.28x = 4,296,101.85
  5. Step 5: Solve for x
    x = 4,296,101.85/3,326.28
  6. Step 6: Final answer
    x = 1,291.56

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1.5x scale

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.