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Finding the Fourth Proportional to 1,805.78, 2,491.73 and 1,019.70

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Solution

The fourth proportional to 1,805.78, 2,491.73 and 1,019.70 is: 1,407.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,805.78 : 2,491.73 = 1,019.70 : x
  2. Step 2: Convert to fraction form
    1,805.78/2,491.73 = 1,019.70/x
  3. Step 3: Cross multiply
    1,805.78x = 2,491.73 × 1,019.70
  4. Step 4: Simplify right side
    1,805.78x = 2,540,817.08
  5. Step 5: Solve for x
    x = 2,540,817.08/1,805.78
  6. Step 6: Final answer
    x = 1,407.05

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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.