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Finding the Fourth Proportional to 2,991.63, 4,129.10 and 1,928.66

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Solution

The fourth proportional to 2,991.63, 4,129.10 and 1,928.66 is: 2,661.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.63 : 4,129.10 = 1,928.66 : x
  2. Step 2: Convert to fraction form
    2,991.63/4,129.10 = 1,928.66/x
  3. Step 3: Cross multiply
    2,991.63x = 4,129.10 × 1,928.66
  4. Step 4: Simplify right side
    2,991.63x = 7,963,635.60
  5. Step 5: Solve for x
    x = 7,963,635.60/2,991.63
  6. Step 6: Final answer
    x = 2,661.97

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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.