Home / 2,157.52-3,236.79-1,280.78

Finding the Fourth Proportional to 2,157.52, 3,236.79 and 1,280.78

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Solution

The fourth proportional to 2,157.52, 3,236.79 and 1,280.78 is: 1,921.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.52 : 3,236.79 = 1,280.78 : x
  2. Step 2: Convert to fraction form
    2,157.52/3,236.79 = 1,280.78/x
  3. Step 3: Cross multiply
    2,157.52x = 3,236.79 × 1,280.78
  4. Step 4: Simplify right side
    2,157.52x = 4,145,628.79
  5. Step 5: Solve for x
    x = 4,145,628.79/2,157.52
  6. Step 6: Final answer
    x = 1,921.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.