Home / 3,921.88-5,412.14-2,153.50

Finding the Fourth Proportional to 3,921.88, 5,412.14 and 2,153.50

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Solution

The fourth proportional to 3,921.88, 5,412.14 and 2,153.50 is: 2,971.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.88 : 5,412.14 = 2,153.50 : x
  2. Step 2: Convert to fraction form
    3,921.88/5,412.14 = 2,153.50/x
  3. Step 3: Cross multiply
    3,921.88x = 5,412.14 × 2,153.50
  4. Step 4: Simplify right side
    3,921.88x = 11,655,043.49
  5. Step 5: Solve for x
    x = 11,655,043.49/3,921.88
  6. Step 6: Final answer
    x = 2,971.80

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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.