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Finding the Fourth Proportional to 65,905.80, 98,858.70 and 18,520.80

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Solution

The fourth proportional to 65,905.80, 98,858.70 and 18,520.80 is: 27,781.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,905.80 : 98,858.70 = 18,520.80 : x
  2. Step 2: Convert to fraction form
    65,905.80/98,858.70 = 18,520.80/x
  3. Step 3: Cross multiply
    65,905.80x = 98,858.70 × 18,520.80
  4. Step 4: Simplify right side
    65,905.80x = 1,830,942,210.96
  5. Step 5: Solve for x
    x = 1,830,942,210.96/65,905.80
  6. Step 6: Final answer
    x = 27,781.20

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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.