Home / 2,939.28-4,055.64-1,891.20

Finding the Fourth Proportional to 2,939.28, 4,055.64 and 1,891.20

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Solution

The fourth proportional to 2,939.28, 4,055.64 and 1,891.20 is: 2,609.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,939.28 : 4,055.64 = 1,891.20 : x
  2. Step 2: Convert to fraction form
    2,939.28/4,055.64 = 1,891.20/x
  3. Step 3: Cross multiply
    2,939.28x = 4,055.64 × 1,891.20
  4. Step 4: Simplify right side
    2,939.28x = 7,670,026.37
  5. Step 5: Solve for x
    x = 7,670,026.37/2,939.28
  6. Step 6: Final answer
    x = 2,609.49

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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.