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Finding the Fourth Proportional to 1,861.13, 2,791.89 and 706.88

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Solution

The fourth proportional to 1,861.13, 2,791.89 and 706.88 is: 1,060.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.13 : 2,791.89 = 706.88 : x
  2. Step 2: Convert to fraction form
    1,861.13/2,791.89 = 706.88/x
  3. Step 3: Cross multiply
    1,861.13x = 2,791.89 × 706.88
  4. Step 4: Simplify right side
    1,861.13x = 1,973,517.24
  5. Step 5: Solve for x
    x = 1,973,517.24/1,861.13
  6. Step 6: Final answer
    x = 1,060.39

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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.