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Finding the Fourth Proportional to 1,861.57, 2,791.90 and 628.96

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Solution

The fourth proportional to 1,861.57, 2,791.90 and 628.96 is: 943.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.57 : 2,791.90 = 628.96 : x
  2. Step 2: Convert to fraction form
    1,861.57/2,791.90 = 628.96/x
  3. Step 3: Cross multiply
    1,861.57x = 2,791.90 × 628.96
  4. Step 4: Simplify right side
    1,861.57x = 1,755,977.89
  5. Step 5: Solve for x
    x = 1,755,977.89/1,861.57
  6. Step 6: Final answer
    x = 943.28

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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.