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Finding the Fourth Proportional to 1,726.92, 2,589.81 and 687.18

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Solution

The fourth proportional to 1,726.92, 2,589.81 and 687.18 is: 1,030.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,726.92 : 2,589.81 = 687.18 : x
  2. Step 2: Convert to fraction form
    1,726.92/2,589.81 = 687.18/x
  3. Step 3: Cross multiply
    1,726.92x = 2,589.81 × 687.18
  4. Step 4: Simplify right side
    1,726.92x = 1,779,665.64
  5. Step 5: Solve for x
    x = 1,779,665.64/1,726.92
  6. Step 6: Final answer
    x = 1,030.54

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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.