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Finding the Fourth Proportional to 1,722.06, 2,581.36 and 681.49

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Solution

The fourth proportional to 1,722.06, 2,581.36 and 681.49 is: 1,021.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,722.06 : 2,581.36 = 681.49 : x
  2. Step 2: Convert to fraction form
    1,722.06/2,581.36 = 681.49/x
  3. Step 3: Cross multiply
    1,722.06x = 2,581.36 × 681.49
  4. Step 4: Simplify right side
    1,722.06x = 1,759,167.62
  5. Step 5: Solve for x
    x = 1,759,167.62/1,722.06
  6. Step 6: Final answer
    x = 1,021.55

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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.