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Finding the Fourth Proportional to 100,578.43, 138,800.67 and 55,259.34

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Solution

The fourth proportional to 100,578.43, 138,800.67 and 55,259.34 is: 76,259.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,578.43 : 138,800.67 = 55,259.34 : x
  2. Step 2: Convert to fraction form
    100,578.43/138,800.67 = 55,259.34/x
  3. Step 3: Cross multiply
    100,578.43x = 138,800.67 × 55,259.34
  4. Step 4: Simplify right side
    100,578.43x = 7,670,034,143.48
  5. Step 5: Solve for x
    x = 7,670,034,143.48/100,578.43
  6. Step 6: Final answer
    x = 76,259.24

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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.