Home / 3,921.07-5,410.93-2,128.47

Finding the Fourth Proportional to 3,921.07, 5,410.93 and 2,128.47

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Solution

The fourth proportional to 3,921.07, 5,410.93 and 2,128.47 is: 2,937.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.07 : 5,410.93 = 2,128.47 : x
  2. Step 2: Convert to fraction form
    3,921.07/5,410.93 = 2,128.47/x
  3. Step 3: Cross multiply
    3,921.07x = 5,410.93 × 2,128.47
  4. Step 4: Simplify right side
    3,921.07x = 11,516,975.12
  5. Step 5: Solve for x
    x = 11,516,975.12/3,921.07
  6. Step 6: Final answer
    x = 2,937.21

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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.