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Finding the Fourth Proportional to 85,691.30, 128,535.59 and 23,361.80

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Solution

The fourth proportional to 85,691.30, 128,535.59 and 23,361.80 is: 35,042.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,691.30 : 128,535.59 = 23,361.80 : x
  2. Step 2: Convert to fraction form
    85,691.30/128,535.59 = 23,361.80/x
  3. Step 3: Cross multiply
    85,691.30x = 128,535.59 × 23,361.80
  4. Step 4: Simplify right side
    85,691.30x = 3,002,822,162.19
  5. Step 5: Solve for x
    x = 3,002,822,162.19/85,691.30
  6. Step 6: Final answer
    x = 35,042.32

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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.