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Finding the Fourth Proportional to 3,726.72, 5,589.72 and 1,129.68

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Solution

The fourth proportional to 3,726.72, 5,589.72 and 1,129.68 is: 1,694.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,726.72 : 5,589.72 = 1,129.68 : x
  2. Step 2: Convert to fraction form
    3,726.72/5,589.72 = 1,129.68/x
  3. Step 3: Cross multiply
    3,726.72x = 5,589.72 × 1,129.68
  4. Step 4: Simplify right side
    3,726.72x = 6,314,594.89
  5. Step 5: Solve for x
    x = 6,314,594.89/3,726.72
  6. Step 6: Final answer
    x = 1,694.41

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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.