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Finding the Fourth Proportional to 1,791.06, 2,686.77 and 620.91

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Solution

The fourth proportional to 1,791.06, 2,686.77 and 620.91 is: 931.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.06 : 2,686.77 = 620.91 : x
  2. Step 2: Convert to fraction form
    1,791.06/2,686.77 = 620.91/x
  3. Step 3: Cross multiply
    1,791.06x = 2,686.77 × 620.91
  4. Step 4: Simplify right side
    1,791.06x = 1,668,242.36
  5. Step 5: Solve for x
    x = 1,668,242.36/1,791.06
  6. Step 6: Final answer
    x = 931.43

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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.