Home / 3,129.45-4,688.10-2,145.30

Finding the Fourth Proportional to 3,129.45, 4,688.10 and 2,145.30

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Solution

The fourth proportional to 3,129.45, 4,688.10 and 2,145.30 is: 3,213.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.45 : 4,688.10 = 2,145.30 : x
  2. Step 2: Convert to fraction form
    3,129.45/4,688.10 = 2,145.30/x
  3. Step 3: Cross multiply
    3,129.45x = 4,688.10 × 2,145.30
  4. Step 4: Simplify right side
    3,129.45x = 10,057,380.93
  5. Step 5: Solve for x
    x = 10,057,380.93/3,129.45
  6. Step 6: Final answer
    x = 3,213.79

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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.