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Finding the Fourth Proportional to 85,728.60, 128,592.90 and 23,399.10

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Solution

The fourth proportional to 85,728.60, 128,592.90 and 23,399.10 is: 35,098.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,728.60 : 128,592.90 = 23,399.10 : x
  2. Step 2: Convert to fraction form
    85,728.60/128,592.90 = 23,399.10/x
  3. Step 3: Cross multiply
    85,728.60x = 128,592.90 × 23,399.10
  4. Step 4: Simplify right side
    85,728.60x = 3,008,958,126.39
  5. Step 5: Solve for x
    x = 3,008,958,126.39/85,728.60
  6. Step 6: Final answer
    x = 35,098.65

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Similar ratio
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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.