Home / 2,991.79-4,128.57-1,665.42

Finding the Fourth Proportional to 2,991.79, 4,128.57 and 1,665.42

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Solution

The fourth proportional to 2,991.79, 4,128.57 and 1,665.42 is: 2,298.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.79 : 4,128.57 = 1,665.42 : x
  2. Step 2: Convert to fraction form
    2,991.79/4,128.57 = 1,665.42/x
  3. Step 3: Cross multiply
    2,991.79x = 4,128.57 × 1,665.42
  4. Step 4: Simplify right side
    2,991.79x = 6,875,816.60
  5. Step 5: Solve for x
    x = 6,875,816.60/2,991.79
  6. Step 6: Final answer
    x = 2,298.23

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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.