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Finding the Fourth Proportional to 38,686, 57,939 and 37,621.80

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Solution

The fourth proportional to 38,686, 57,939 and 37,621.80 is: 56,345.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,686 : 57,939 = 37,621.80 : x
  2. Step 2: Convert to fraction form
    38,686/57,939 = 37,621.80/x
  3. Step 3: Cross multiply
    38,686x = 57,939 × 37,621.80
  4. Step 4: Simplify right side
    38,686x = 2,179,769,470.20
  5. Step 5: Solve for x
    x = 2,179,769,470.20/38,686
  6. Step 6: Final answer
    x = 56,345.18

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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.