Home / 2,781.13-4,172.16-1,319.49

Finding the Fourth Proportional to 2,781.13, 4,172.16 and 1,319.49

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Solution

The fourth proportional to 2,781.13, 4,172.16 and 1,319.49 is: 1,979.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,781.13 : 4,172.16 = 1,319.49 : x
  2. Step 2: Convert to fraction form
    2,781.13/4,172.16 = 1,319.49/x
  3. Step 3: Cross multiply
    2,781.13x = 4,172.16 × 1,319.49
  4. Step 4: Simplify right side
    2,781.13x = 5,505,102.54
  5. Step 5: Solve for x
    x = 5,505,102.54/2,781.13
  6. Step 6: Final answer
    x = 1,979.45

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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.