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Finding the Fourth Proportional to 2,622.90, 3,933.92 and 891.54

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Solution

The fourth proportional to 2,622.90, 3,933.92 and 891.54 is: 1,337.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,622.90 : 3,933.92 = 891.54 : x
  2. Step 2: Convert to fraction form
    2,622.90/3,933.92 = 891.54/x
  3. Step 3: Cross multiply
    2,622.90x = 3,933.92 × 891.54
  4. Step 4: Simplify right side
    2,622.90x = 3,507,247.04
  5. Step 5: Solve for x
    x = 3,507,247.04/2,622.90
  6. Step 6: Final answer
    x = 1,337.16

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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.