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Finding the Fourth Proportional to 1,721.84, 2,581.56 and 681.08

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Solution

The fourth proportional to 1,721.84, 2,581.56 and 681.08 is: 1,021.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.84 : 2,581.56 = 681.08 : x
  2. Step 2: Convert to fraction form
    1,721.84/2,581.56 = 681.08/x
  3. Step 3: Cross multiply
    1,721.84x = 2,581.56 × 681.08
  4. Step 4: Simplify right side
    1,721.84x = 1,758,248.88
  5. Step 5: Solve for x
    x = 1,758,248.88/1,721.84
  6. Step 6: Final answer
    x = 1,021.15

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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.