Home / 2,991.10-4,128.51-2,107.30

Finding the Fourth Proportional to 2,991.10, 4,128.51 and 2,107.30

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Solution

The fourth proportional to 2,991.10, 4,128.51 and 2,107.30 is: 2,908.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.10 : 4,128.51 = 2,107.30 : x
  2. Step 2: Convert to fraction form
    2,991.10/4,128.51 = 2,107.30/x
  3. Step 3: Cross multiply
    2,991.10x = 4,128.51 × 2,107.30
  4. Step 4: Simplify right side
    2,991.10x = 8,700,009.12
  5. Step 5: Solve for x
    x = 8,700,009.12/2,991.10
  6. Step 6: Final answer
    x = 2,908.63

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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.