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Finding the Fourth Proportional to 2,991.84, 4,128.60 and 1,665.48

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Solution

The fourth proportional to 2,991.84, 4,128.60 and 1,665.48 is: 2,298.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.84 : 4,128.60 = 1,665.48 : x
  2. Step 2: Convert to fraction form
    2,991.84/4,128.60 = 1,665.48/x
  3. Step 3: Cross multiply
    2,991.84x = 4,128.60 × 1,665.48
  4. Step 4: Simplify right side
    2,991.84x = 6,876,100.73
  5. Step 5: Solve for x
    x = 6,876,100.73/2,991.84
  6. Step 6: Final answer
    x = 2,298.28

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1.5x scale

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.