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Finding the Fourth Proportional to 3,726.89, 5,143.74 and 2,155.89

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Solution

The fourth proportional to 3,726.89, 5,143.74 and 2,155.89 is: 2,975.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,726.89 : 5,143.74 = 2,155.89 : x
  2. Step 2: Convert to fraction form
    3,726.89/5,143.74 = 2,155.89/x
  3. Step 3: Cross multiply
    3,726.89x = 5,143.74 × 2,155.89
  4. Step 4: Simplify right side
    3,726.89x = 11,089,326.85
  5. Step 5: Solve for x
    x = 11,089,326.85/3,726.89
  6. Step 6: Final answer
    x = 2,975.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.