Home / 2,991.91-4,128.63-1,665.58

Finding the Fourth Proportional to 2,991.91, 4,128.63 and 1,665.58

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Solution

The fourth proportional to 2,991.91, 4,128.63 and 1,665.58 is: 2,298.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.91 : 4,128.63 = 1,665.58 : x
  2. Step 2: Convert to fraction form
    2,991.91/4,128.63 = 1,665.58/x
  3. Step 3: Cross multiply
    2,991.91x = 4,128.63 × 1,665.58
  4. Step 4: Simplify right side
    2,991.91x = 6,876,542.91
  5. Step 5: Solve for x
    x = 6,876,542.91/2,991.91
  6. Step 6: Final answer
    x = 2,298.38

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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.