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Finding the Fourth Proportional to 100,628.25, 138,760.59 and 84,484.43

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Solution

The fourth proportional to 100,628.25, 138,760.59 and 84,484.43 is: 116,499.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,628.25 : 138,760.59 = 84,484.43 : x
  2. Step 2: Convert to fraction form
    100,628.25/138,760.59 = 84,484.43/x
  3. Step 3: Cross multiply
    100,628.25x = 138,760.59 × 84,484.43
  4. Step 4: Simplify right side
    100,628.25x = 11,723,109,352.61
  5. Step 5: Solve for x
    x = 11,723,109,352.61/100,628.25
  6. Step 6: Final answer
    x = 116,499.19

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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.