Home / 5,129.65-7,078.77-2,891.49

Finding the Fourth Proportional to 5,129.65, 7,078.77 and 2,891.49

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Solution

The fourth proportional to 5,129.65, 7,078.77 and 2,891.49 is: 3,990.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,129.65 : 7,078.77 = 2,891.49 : x
  2. Step 2: Convert to fraction form
    5,129.65/7,078.77 = 2,891.49/x
  3. Step 3: Cross multiply
    5,129.65x = 7,078.77 × 2,891.49
  4. Step 4: Simplify right side
    5,129.65x = 20,468,192.67
  5. Step 5: Solve for x
    x = 20,468,192.67/5,129.65
  6. Step 6: Final answer
    x = 3,990.17

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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.