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Finding the Fourth Proportional to 1,791.60, 2,688.20 and 622

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Solution

The fourth proportional to 1,791.60, 2,688.20 and 622 is: 933.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.60 : 2,688.20 = 622 : x
  2. Step 2: Convert to fraction form
    1,791.60/2,688.20 = 622/x
  3. Step 3: Cross multiply
    1,791.60x = 2,688.20 × 622
  4. Step 4: Simplify right side
    1,791.60x = 1,672,060.40
  5. Step 5: Solve for x
    x = 1,672,060.40/1,791.60
  6. Step 6: Final answer
    x = 933.28

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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.