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Finding the Fourth Proportional to 100,682.86, 138,942.87 and 55,363.77

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Solution

The fourth proportional to 100,682.86, 138,942.87 and 55,363.77 is: 76,402.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,682.86 : 138,942.87 = 55,363.77 : x
  2. Step 2: Convert to fraction form
    100,682.86/138,942.87 = 55,363.77/x
  3. Step 3: Cross multiply
    100,682.86x = 138,942.87 × 55,363.77
  4. Step 4: Simplify right side
    100,682.86x = 7,692,401,097.82
  5. Step 5: Solve for x
    x = 7,692,401,097.82/100,682.86
  6. Step 6: Final answer
    x = 76,402.29

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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.