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Finding the Fourth Proportional to 100,449.76, 138,639.78 and 66,458.92

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Solution

The fourth proportional to 100,449.76, 138,639.78 and 66,458.92 is: 91,725.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,449.76 : 138,639.78 = 66,458.92 : x
  2. Step 2: Convert to fraction form
    100,449.76/138,639.78 = 66,458.92/x
  3. Step 3: Cross multiply
    100,449.76x = 138,639.78 × 66,458.92
  4. Step 4: Simplify right side
    100,449.76x = 9,213,850,047.84
  5. Step 5: Solve for x
    x = 9,213,850,047.84/100,449.76
  6. Step 6: Final answer
    x = 91,725.95

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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.