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Finding the Fourth Proportional to 100,643.21, 138,884.62 and 57,621.27

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Solution

The fourth proportional to 100,643.21, 138,884.62 and 57,621.27 is: 79,515.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,643.21 : 138,884.62 = 57,621.27 : x
  2. Step 2: Convert to fraction form
    100,643.21/138,884.62 = 57,621.27/x
  3. Step 3: Cross multiply
    100,643.21x = 138,884.62 × 57,621.27
  4. Step 4: Simplify right side
    100,643.21x = 8,002,708,187.87
  5. Step 5: Solve for x
    x = 8,002,708,187.87/100,643.21
  6. Step 6: Final answer
    x = 79,515.63

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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.