Home / 3,921.60-5,411.72-2,153.20

Finding the Fourth Proportional to 3,921.60, 5,411.72 and 2,153.20

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Solution

The fourth proportional to 3,921.60, 5,411.72 and 2,153.20 is: 2,971.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.60 : 5,411.72 = 2,153.20 : x
  2. Step 2: Convert to fraction form
    3,921.60/5,411.72 = 2,153.20/x
  3. Step 3: Cross multiply
    3,921.60x = 5,411.72 × 2,153.20
  4. Step 4: Simplify right side
    3,921.60x = 11,652,515.50
  5. Step 5: Solve for x
    x = 11,652,515.50/3,921.60
  6. Step 6: Final answer
    x = 2,971.37

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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.