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Finding the Fourth Proportional to 1,993.16, 2,750.81 and 1,207.21

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Solution

The fourth proportional to 1,993.16, 2,750.81 and 1,207.21 is: 1,666.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.16 : 2,750.81 = 1,207.21 : x
  2. Step 2: Convert to fraction form
    1,993.16/2,750.81 = 1,207.21/x
  3. Step 3: Cross multiply
    1,993.16x = 2,750.81 × 1,207.21
  4. Step 4: Simplify right side
    1,993.16x = 3,320,785.55
  5. Step 5: Solve for x
    x = 3,320,785.55/1,993.16
  6. Step 6: Final answer
    x = 1,666.09

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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.