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Finding the Fourth Proportional to 1,563.92, 2,157.76 and 891.73

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Solution

The fourth proportional to 1,563.92, 2,157.76 and 891.73 is: 1,230.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,563.92 : 2,157.76 = 891.73 : x
  2. Step 2: Convert to fraction form
    1,563.92/2,157.76 = 891.73/x
  3. Step 3: Cross multiply
    1,563.92x = 2,157.76 × 891.73
  4. Step 4: Simplify right side
    1,563.92x = 1,924,139.32
  5. Step 5: Solve for x
    x = 1,924,139.32/1,563.92
  6. Step 6: Final answer
    x = 1,230.33

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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.