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Finding the Fourth Proportional to 1,991.66, 2,746.20 and 1,617.48

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Solution

The fourth proportional to 1,991.66, 2,746.20 and 1,617.48 is: 2,230.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.66 : 2,746.20 = 1,617.48 : x
  2. Step 2: Convert to fraction form
    1,991.66/2,746.20 = 1,617.48/x
  3. Step 3: Cross multiply
    1,991.66x = 2,746.20 × 1,617.48
  4. Step 4: Simplify right side
    1,991.66x = 4,441,923.58
  5. Step 5: Solve for x
    x = 4,441,923.58/1,991.66
  6. Step 6: Final answer
    x = 2,230.26

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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.