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Finding the Fourth Proportional to 5,705.78, 7,873.91 and 3,187.94

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Solution

The fourth proportional to 5,705.78, 7,873.91 and 3,187.94 is: 4,399.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,705.78 : 7,873.91 = 3,187.94 : x
  2. Step 2: Convert to fraction form
    5,705.78/7,873.91 = 3,187.94/x
  3. Step 3: Cross multiply
    5,705.78x = 7,873.91 × 3,187.94
  4. Step 4: Simplify right side
    5,705.78x = 25,101,552.65
  5. Step 5: Solve for x
    x = 25,101,552.65/5,705.78
  6. Step 6: Final answer
    x = 4,399.32

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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.