Home / 138,905.39-191,685.50-81,543.80

Finding the Fourth Proportional to 138,905.39, 191,685.50 and 81,543.80

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Solution

The fourth proportional to 138,905.39, 191,685.50 and 81,543.80 is: 112,528.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,905.39 : 191,685.50 = 81,543.80 : x
  2. Step 2: Convert to fraction form
    138,905.39/191,685.50 = 81,543.80/x
  3. Step 3: Cross multiply
    138,905.39x = 191,685.50 × 81,543.80
  4. Step 4: Simplify right side
    138,905.39x = 15,630,764,074.90
  5. Step 5: Solve for x
    x = 15,630,764,074.90/138,905.39
  6. Step 6: Final answer
    x = 112,528.13

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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.