Home / 138,730.97-191,439.68-78,293.39

Finding the Fourth Proportional to 138,730.97, 191,439.68 and 78,293.39

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Solution

The fourth proportional to 138,730.97, 191,439.68 and 78,293.39 is: 108,039.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,730.97 : 191,439.68 = 78,293.39 : x
  2. Step 2: Convert to fraction form
    138,730.97/191,439.68 = 78,293.39/x
  3. Step 3: Cross multiply
    138,730.97x = 191,439.68 × 78,293.39
  4. Step 4: Simplify right side
    138,730.97x = 14,988,460,179.05
  5. Step 5: Solve for x
    x = 14,988,460,179.05/138,730.97
  6. Step 6: Final answer
    x = 108,039.76

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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.