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Finding the Fourth Proportional to 28,691.70, 39,580.89 and 19,136.00

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Solution

The fourth proportional to 28,691.70, 39,580.89 and 19,136.00 is: 26,398.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,691.70 : 39,580.89 = 19,136.00 : x
  2. Step 2: Convert to fraction form
    28,691.70/39,580.89 = 19,136.00/x
  3. Step 3: Cross multiply
    28,691.70x = 39,580.89 × 19,136.00
  4. Step 4: Simplify right side
    28,691.70x = 757,419,713.14
  5. Step 5: Solve for x
    x = 757,419,713.14/28,691.70
  6. Step 6: Final answer
    x = 26,398.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.