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Finding the Fourth Proportional to 2,189.82, 3,285.28 and 891.66

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Solution

The fourth proportional to 2,189.82, 3,285.28 and 891.66 is: 1,337.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.82 : 3,285.28 = 891.66 : x
  2. Step 2: Convert to fraction form
    2,189.82/3,285.28 = 891.66/x
  3. Step 3: Cross multiply
    2,189.82x = 3,285.28 × 891.66
  4. Step 4: Simplify right side
    2,189.82x = 2,929,352.76
  5. Step 5: Solve for x
    x = 2,929,352.76/2,189.82
  6. Step 6: Final answer
    x = 1,337.71

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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.