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Finding the Fourth Proportional to 2,991.52, 4,128.16 and 1,665.21

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Solution

The fourth proportional to 2,991.52, 4,128.16 and 1,665.21 is: 2,297.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.52 : 4,128.16 = 1,665.21 : x
  2. Step 2: Convert to fraction form
    2,991.52/4,128.16 = 1,665.21/x
  3. Step 3: Cross multiply
    2,991.52x = 4,128.16 × 1,665.21
  4. Step 4: Simplify right side
    2,991.52x = 6,874,253.31
  5. Step 5: Solve for x
    x = 6,874,253.31/2,991.52
  6. Step 6: Final answer
    x = 2,297.91

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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.