Home / 3,911.23-5,397.56-2,142.78

Finding the Fourth Proportional to 3,911.23, 5,397.56 and 2,142.78

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Solution

The fourth proportional to 3,911.23, 5,397.56 and 2,142.78 is: 2,957.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.23 : 5,397.56 = 2,142.78 : x
  2. Step 2: Convert to fraction form
    3,911.23/5,397.56 = 2,142.78/x
  3. Step 3: Cross multiply
    3,911.23x = 5,397.56 × 2,142.78
  4. Step 4: Simplify right side
    3,911.23x = 11,565,783.62
  5. Step 5: Solve for x
    x = 11,565,783.62/3,911.23
  6. Step 6: Final answer
    x = 2,957.07

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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.