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Finding the Fourth Proportional to 100,436.87, 138,602.50 and 55,115.61

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Solution

The fourth proportional to 100,436.87, 138,602.50 and 55,115.61 is: 76,059.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,436.87 : 138,602.50 = 55,115.61 : x
  2. Step 2: Convert to fraction form
    100,436.87/138,602.50 = 55,115.61/x
  3. Step 3: Cross multiply
    100,436.87x = 138,602.50 × 55,115.61
  4. Step 4: Simplify right side
    100,436.87x = 7,639,161,335.03
  5. Step 5: Solve for x
    x = 7,639,161,335.03/100,436.87
  6. Step 6: Final answer
    x = 76,059.33

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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.