Home / 138,516.13-191,153.96-78,086.80

Finding the Fourth Proportional to 138,516.13, 191,153.96 and 78,086.80

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Solution

The fourth proportional to 138,516.13, 191,153.96 and 78,086.80 is: 107,760.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,516.13 : 191,153.96 = 78,086.80 : x
  2. Step 2: Convert to fraction form
    138,516.13/191,153.96 = 78,086.80/x
  3. Step 3: Cross multiply
    138,516.13x = 191,153.96 × 78,086.80
  4. Step 4: Simplify right side
    138,516.13x = 14,926,601,043.73
  5. Step 5: Solve for x
    x = 14,926,601,043.73/138,516.13
  6. Step 6: Final answer
    x = 107,760.74

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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.