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Finding the Fourth Proportional to 1,566.31, 2,161.46 and 885

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Solution

The fourth proportional to 1,566.31, 2,161.46 and 885 is: 1,221.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,566.31 : 2,161.46 = 885 : x
  2. Step 2: Convert to fraction form
    1,566.31/2,161.46 = 885/x
  3. Step 3: Cross multiply
    1,566.31x = 2,161.46 × 885
  4. Step 4: Simplify right side
    1,566.31x = 1,912,892.10
  5. Step 5: Solve for x
    x = 1,912,892.10/1,566.31
  6. Step 6: Final answer
    x = 1,221.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.