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Finding the Fourth Proportional to 127,720.80, 191,581.20 and 81,026.40

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Solution

The fourth proportional to 127,720.80, 191,581.20 and 81,026.40 is: 121,539.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,720.80 : 191,581.20 = 81,026.40 : x
  2. Step 2: Convert to fraction form
    127,720.80/191,581.20 = 81,026.40/x
  3. Step 3: Cross multiply
    127,720.80x = 191,581.20 × 81,026.40
  4. Step 4: Simplify right side
    127,720.80x = 15,523,134,943.68
  5. Step 5: Solve for x
    x = 15,523,134,943.68/127,720.80
  6. Step 6: Final answer
    x = 121,539.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.