Home / 3,921.40-5,411.62-2,128.94

Finding the Fourth Proportional to 3,921.40, 5,411.62 and 2,128.94

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Solution

The fourth proportional to 3,921.40, 5,411.62 and 2,128.94 is: 2,937.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.40 : 5,411.62 = 2,128.94 : x
  2. Step 2: Convert to fraction form
    3,921.40/5,411.62 = 2,128.94/x
  3. Step 3: Cross multiply
    3,921.40x = 5,411.62 × 2,128.94
  4. Step 4: Simplify right side
    3,921.40x = 11,521,040.62
  5. Step 5: Solve for x
    x = 11,521,040.62/3,921.40
  6. Step 6: Final answer
    x = 2,937.99

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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.