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Finding the Fourth Proportional to 2,980.51, 4,112.49 and 1,721.55

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Solution

The fourth proportional to 2,980.51, 4,112.49 and 1,721.55 is: 2,375.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,980.51 : 4,112.49 = 1,721.55 : x
  2. Step 2: Convert to fraction form
    2,980.51/4,112.49 = 1,721.55/x
  3. Step 3: Cross multiply
    2,980.51x = 4,112.49 × 1,721.55
  4. Step 4: Simplify right side
    2,980.51x = 7,079,857.16
  5. Step 5: Solve for x
    x = 7,079,857.16/2,980.51
  6. Step 6: Final answer
    x = 2,375.38

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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.