Home / 3,856.80-5,321.64-2,285.20

Finding the Fourth Proportional to 3,856.80, 5,321.64 and 2,285.20

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Solution

The fourth proportional to 3,856.80, 5,321.64 and 2,285.20 is: 3,153.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,856.80 : 5,321.64 = 2,285.20 : x
  2. Step 2: Convert to fraction form
    3,856.80/5,321.64 = 2,285.20/x
  3. Step 3: Cross multiply
    3,856.80x = 5,321.64 × 2,285.20
  4. Step 4: Simplify right side
    3,856.80x = 12,161,011.73
  5. Step 5: Solve for x
    x = 12,161,011.73/3,856.80
  6. Step 6: Final answer
    x = 3,153.14

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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.