Home / 138,609.39-191,280.69-78,179.85

Finding the Fourth Proportional to 138,609.39, 191,280.69 and 78,179.85

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Solution

The fourth proportional to 138,609.39, 191,280.69 and 78,179.85 is: 107,888.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,609.39 : 191,280.69 = 78,179.85 : x
  2. Step 2: Convert to fraction form
    138,609.39/191,280.69 = 78,179.85/x
  3. Step 3: Cross multiply
    138,609.39x = 191,280.69 × 78,179.85
  4. Step 4: Simplify right side
    138,609.39x = 14,954,295,652.10
  5. Step 5: Solve for x
    x = 14,954,295,652.10/138,609.39
  6. Step 6: Final answer
    x = 107,888.04

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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.