Home / 2,991.87-4,128.77-1,665.55

Finding the Fourth Proportional to 2,991.87, 4,128.77 and 1,665.55

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Solution

The fourth proportional to 2,991.87, 4,128.77 and 1,665.55 is: 2,298.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.87 : 4,128.77 = 1,665.55 : x
  2. Step 2: Convert to fraction form
    2,991.87/4,128.77 = 1,665.55/x
  3. Step 3: Cross multiply
    2,991.87x = 4,128.77 × 1,665.55
  4. Step 4: Simplify right side
    2,991.87x = 6,876,666.72
  5. Step 5: Solve for x
    x = 6,876,666.72/2,991.87
  6. Step 6: Final answer
    x = 2,298.45

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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.