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Finding the Fourth Proportional to 1,721.42, 2,583.19 and 681.25

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Solution

The fourth proportional to 1,721.42, 2,583.19 and 681.25 is: 1,022.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.42 : 2,583.19 = 681.25 : x
  2. Step 2: Convert to fraction form
    1,721.42/2,583.19 = 681.25/x
  3. Step 3: Cross multiply
    1,721.42x = 2,583.19 × 681.25
  4. Step 4: Simplify right side
    1,721.42x = 1,759,785.27
  5. Step 5: Solve for x
    x = 1,759,785.27/1,721.42
  6. Step 6: Final answer
    x = 1,022.29

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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.