Home / 2,781.77-4,173.09-1,320.12

Finding the Fourth Proportional to 2,781.77, 4,173.09 and 1,320.12

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Solution

The fourth proportional to 2,781.77, 4,173.09 and 1,320.12 is: 1,980.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,781.77 : 4,173.09 = 1,320.12 : x
  2. Step 2: Convert to fraction form
    2,781.77/4,173.09 = 1,320.12/x
  3. Step 3: Cross multiply
    2,781.77x = 4,173.09 × 1,320.12
  4. Step 4: Simplify right side
    2,781.77x = 5,508,979.57
  5. Step 5: Solve for x
    x = 5,508,979.57/2,781.77
  6. Step 6: Final answer
    x = 1,980.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.