Home / 5,120.31-7,072.55-3,917.97

Finding the Fourth Proportional to 5,120.31, 7,072.55 and 3,917.97

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Solution

The fourth proportional to 5,120.31, 7,072.55 and 3,917.97 is: 5,411.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.31 : 7,072.55 = 3,917.97 : x
  2. Step 2: Convert to fraction form
    5,120.31/7,072.55 = 3,917.97/x
  3. Step 3: Cross multiply
    5,120.31x = 7,072.55 × 3,917.97
  4. Step 4: Simplify right side
    5,120.31x = 27,710,019.13
  5. Step 5: Solve for x
    x = 27,710,019.13/5,120.31
  6. Step 6: Final answer
    x = 5,411.79

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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.