Home / 1,979.36-2,731.68-1,140.20

Finding the Fourth Proportional to 1,979.36, 2,731.68 and 1,140.20

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Solution

The fourth proportional to 1,979.36, 2,731.68 and 1,140.20 is: 1,573.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.36 : 2,731.68 = 1,140.20 : x
  2. Step 2: Convert to fraction form
    1,979.36/2,731.68 = 1,140.20/x
  3. Step 3: Cross multiply
    1,979.36x = 2,731.68 × 1,140.20
  4. Step 4: Simplify right side
    1,979.36x = 3,114,661.54
  5. Step 5: Solve for x
    x = 3,114,661.54/1,979.36
  6. Step 6: Final answer
    x = 1,573.57

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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.