Home / 2,991.68-4,128.40-1,665.42

Finding the Fourth Proportional to 2,991.68, 4,128.40 and 1,665.42

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Solution

The fourth proportional to 2,991.68, 4,128.40 and 1,665.42 is: 2,298.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.68 : 4,128.40 = 1,665.42 : x
  2. Step 2: Convert to fraction form
    2,991.68/4,128.40 = 1,665.42/x
  3. Step 3: Cross multiply
    2,991.68x = 4,128.40 × 1,665.42
  4. Step 4: Simplify right side
    2,991.68x = 6,875,519.93
  5. Step 5: Solve for x
    x = 6,875,519.93/2,991.68
  6. Step 6: Final answer
    x = 2,298.21

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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.