Home / 3,922.40-5,412.79-2,153.95

Finding the Fourth Proportional to 3,922.40, 5,412.79 and 2,153.95

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Solution

The fourth proportional to 3,922.40, 5,412.79 and 2,153.95 is: 2,972.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,922.40 : 5,412.79 = 2,153.95 : x
  2. Step 2: Convert to fraction form
    3,922.40/5,412.79 = 2,153.95/x
  3. Step 3: Cross multiply
    3,922.40x = 5,412.79 × 2,153.95
  4. Step 4: Simplify right side
    3,922.40x = 11,658,879.02
  5. Step 5: Solve for x
    x = 11,658,879.02/3,922.40
  6. Step 6: Final answer
    x = 2,972.38

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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.