Home / 138,609.58-191,280.94-78,180.04

Finding the Fourth Proportional to 138,609.58, 191,280.94 and 78,180.04

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Solution

The fourth proportional to 138,609.58, 191,280.94 and 78,180.04 is: 107,888.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,609.58 : 191,280.94 = 78,180.04 : x
  2. Step 2: Convert to fraction form
    138,609.58/191,280.94 = 78,180.04/x
  3. Step 3: Cross multiply
    138,609.58x = 191,280.94 × 78,180.04
  4. Step 4: Simplify right side
    138,609.58x = 14,954,351,540.44
  5. Step 5: Solve for x
    x = 14,954,351,540.44/138,609.58
  6. Step 6: Final answer
    x = 107,888.30

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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.