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Finding the Fourth Proportional to 100,328.86, 138,455.17 and 55,006.73

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Solution

The fourth proportional to 100,328.86, 138,455.17 and 55,006.73 is: 75,910.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,328.86 : 138,455.17 = 55,006.73 : x
  2. Step 2: Convert to fraction form
    100,328.86/138,455.17 = 55,006.73/x
  3. Step 3: Cross multiply
    100,328.86x = 138,455.17 × 55,006.73
  4. Step 4: Simplify right side
    100,328.86x = 7,615,965,669.64
  5. Step 5: Solve for x
    x = 7,615,965,669.64/100,328.86
  6. Step 6: Final answer
    x = 75,910.02

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1.5x scale

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.