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Finding the Fourth Proportional to 18,911.70, 26,134.11 and 14,187.78

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Solution

The fourth proportional to 18,911.70, 26,134.11 and 14,187.78 is: 19,606.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.70 : 26,134.11 = 14,187.78 : x
  2. Step 2: Convert to fraction form
    18,911.70/26,134.11 = 14,187.78/x
  3. Step 3: Cross multiply
    18,911.70x = 26,134.11 × 14,187.78
  4. Step 4: Simplify right side
    18,911.70x = 370,785,003.18
  5. Step 5: Solve for x
    x = 370,785,003.18/18,911.70
  6. Step 6: Final answer
    x = 19,606.12

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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.