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Finding the Fourth Proportional to 1,227.11, 1,840.01 and 640.69

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Solution

The fourth proportional to 1,227.11, 1,840.01 and 640.69 is: 960.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.11 : 1,840.01 = 640.69 : x
  2. Step 2: Convert to fraction form
    1,227.11/1,840.01 = 640.69/x
  3. Step 3: Cross multiply
    1,227.11x = 1,840.01 × 640.69
  4. Step 4: Simplify right side
    1,227.11x = 1,178,885.67
  5. Step 5: Solve for x
    x = 1,178,885.67/1,227.11
  6. Step 6: Final answer
    x = 960.70

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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.