Home / 5,138.81-7,091.61-2,781.00

Finding the Fourth Proportional to 5,138.81, 7,091.61 and 2,781.00

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Solution

The fourth proportional to 5,138.81, 7,091.61 and 2,781.00 is: 3,837.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.81 : 7,091.61 = 2,781.00 : x
  2. Step 2: Convert to fraction form
    5,138.81/7,091.61 = 2,781.00/x
  3. Step 3: Cross multiply
    5,138.81x = 7,091.61 × 2,781.00
  4. Step 4: Simplify right side
    5,138.81x = 19,721,804.43
  5. Step 5: Solve for x
    x = 19,721,804.43/5,138.81
  6. Step 6: Final answer
    x = 3,837.81

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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.