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Finding the Fourth Proportional to 1,721.90, 2,581.33 and 682.63

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Solution

The fourth proportional to 1,721.90, 2,581.33 and 682.63 is: 1,023.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.90 : 2,581.33 = 682.63 : x
  2. Step 2: Convert to fraction form
    1,721.90/2,581.33 = 682.63/x
  3. Step 3: Cross multiply
    1,721.90x = 2,581.33 × 682.63
  4. Step 4: Simplify right side
    1,721.90x = 1,762,098.66
  5. Step 5: Solve for x
    x = 1,762,098.66/1,721.90
  6. Step 6: Final answer
    x = 1,023.35

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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.