Home / 3,913.56-5,400.78-2,145.15

Finding the Fourth Proportional to 3,913.56, 5,400.78 and 2,145.15

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Solution

The fourth proportional to 3,913.56, 5,400.78 and 2,145.15 is: 2,960.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,913.56 : 5,400.78 = 2,145.15 : x
  2. Step 2: Convert to fraction form
    3,913.56/5,400.78 = 2,145.15/x
  3. Step 3: Cross multiply
    3,913.56x = 5,400.78 × 2,145.15
  4. Step 4: Simplify right side
    3,913.56x = 11,585,483.22
  5. Step 5: Solve for x
    x = 11,585,483.22/3,913.56
  6. Step 6: Final answer
    x = 2,960.34

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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.