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Finding the Fourth Proportional to 100,518.76, 138,620.80 and 66,002.61

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Solution

The fourth proportional to 100,518.76, 138,620.80 and 66,002.61 is: 91,021.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,518.76 : 138,620.80 = 66,002.61 : x
  2. Step 2: Convert to fraction form
    100,518.76/138,620.80 = 66,002.61/x
  3. Step 3: Cross multiply
    100,518.76x = 138,620.80 × 66,002.61
  4. Step 4: Simplify right side
    100,518.76x = 9,149,335,235.68
  5. Step 5: Solve for x
    x = 9,149,335,235.68/100,518.76
  6. Step 6: Final answer
    x = 91,021.17

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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.