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Finding the Fourth Proportional to 137,639.94, 189,906.84 and 79,482.42

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Solution

The fourth proportional to 137,639.94, 189,906.84 and 79,482.42 is: 109,664.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,639.94 : 189,906.84 = 79,482.42 : x
  2. Step 2: Convert to fraction form
    137,639.94/189,906.84 = 79,482.42/x
  3. Step 3: Cross multiply
    137,639.94x = 189,906.84 × 79,482.42
  4. Step 4: Simplify right side
    137,639.94x = 15,094,255,217.75
  5. Step 5: Solve for x
    x = 15,094,255,217.75/137,639.94
  6. Step 6: Final answer
    x = 109,664.79

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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.