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Finding the Fourth Proportional to 2,879.65, 3,970.78 and 2,215.05

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Solution

The fourth proportional to 2,879.65, 3,970.78 and 2,215.05 is: 3,054.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,879.65 : 3,970.78 = 2,215.05 : x
  2. Step 2: Convert to fraction form
    2,879.65/3,970.78 = 2,215.05/x
  3. Step 3: Cross multiply
    2,879.65x = 3,970.78 × 2,215.05
  4. Step 4: Simplify right side
    2,879.65x = 8,795,476.24
  5. Step 5: Solve for x
    x = 8,795,476.24/2,879.65
  6. Step 6: Final answer
    x = 3,054.36

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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.