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Finding the Fourth Proportional to 127,872.20, 191,808.30 and 77,133.80

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Solution

The fourth proportional to 127,872.20, 191,808.30 and 77,133.80 is: 115,700.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,872.20 : 191,808.30 = 77,133.80 : x
  2. Step 2: Convert to fraction form
    127,872.20/191,808.30 = 77,133.80/x
  3. Step 3: Cross multiply
    127,872.20x = 191,808.30 × 77,133.80
  4. Step 4: Simplify right side
    127,872.20x = 14,794,903,050.54
  5. Step 5: Solve for x
    x = 14,794,903,050.54/127,872.20
  6. Step 6: Final answer
    x = 115,700.70

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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.