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Finding the Fourth Proportional to 1,721.67, 2,581.29 and 855.51

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Solution

The fourth proportional to 1,721.67, 2,581.29 and 855.51 is: 1,282.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.67 : 2,581.29 = 855.51 : x
  2. Step 2: Convert to fraction form
    1,721.67/2,581.29 = 855.51/x
  3. Step 3: Cross multiply
    1,721.67x = 2,581.29 × 855.51
  4. Step 4: Simplify right side
    1,721.67x = 2,208,319.41
  5. Step 5: Solve for x
    x = 2,208,319.41/1,721.67
  6. Step 6: Final answer
    x = 1,282.66

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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.