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Finding the Fourth Proportional to 1,293.06, 1,939.59 and 805.17

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Solution

The fourth proportional to 1,293.06, 1,939.59 and 805.17 is: 1,207.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.06 : 1,939.59 = 805.17 : x
  2. Step 2: Convert to fraction form
    1,293.06/1,939.59 = 805.17/x
  3. Step 3: Cross multiply
    1,293.06x = 1,939.59 × 805.17
  4. Step 4: Simplify right side
    1,293.06x = 1,561,699.68
  5. Step 5: Solve for x
    x = 1,561,699.68/1,293.06
  6. Step 6: Final answer
    x = 1,207.76

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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.