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Finding the Fourth Proportional to 3,621.71, 4,999.15 and 2,129.56

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Solution

The fourth proportional to 3,621.71, 4,999.15 and 2,129.56 is: 2,939.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,621.71 : 4,999.15 = 2,129.56 : x
  2. Step 2: Convert to fraction form
    3,621.71/4,999.15 = 2,129.56/x
  3. Step 3: Cross multiply
    3,621.71x = 4,999.15 × 2,129.56
  4. Step 4: Simplify right side
    3,621.71x = 10,645,980.04
  5. Step 5: Solve for x
    x = 10,645,980.04/3,621.71
  6. Step 6: Final answer
    x = 2,939.49

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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.