Home / 2,939.20-4,056.30-2,742.40

Finding the Fourth Proportional to 2,939.20, 4,056.30 and 2,742.40

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Solution

The fourth proportional to 2,939.20, 4,056.30 and 2,742.40 is: 3,784.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,939.20 : 4,056.30 = 2,742.40 : x
  2. Step 2: Convert to fraction form
    2,939.20/4,056.30 = 2,742.40/x
  3. Step 3: Cross multiply
    2,939.20x = 4,056.30 × 2,742.40
  4. Step 4: Simplify right side
    2,939.20x = 11,123,997.12
  5. Step 5: Solve for x
    x = 11,123,997.12/2,939.20
  6. Step 6: Final answer
    x = 3,784.70

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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.