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Finding the Fourth Proportional to 1,993.72, 2,990.94 and 840.28

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Solution

The fourth proportional to 1,993.72, 2,990.94 and 840.28 is: 1,260.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.72 : 2,990.94 = 840.28 : x
  2. Step 2: Convert to fraction form
    1,993.72/2,990.94 = 840.28/x
  3. Step 3: Cross multiply
    1,993.72x = 2,990.94 × 840.28
  4. Step 4: Simplify right side
    1,993.72x = 2,513,227.06
  5. Step 5: Solve for x
    x = 2,513,227.06/1,993.72
  6. Step 6: Final answer
    x = 1,260.57

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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.