Home / 2,172.90-3,271.10-1,979.15

Finding the Fourth Proportional to 2,172.90, 3,271.10 and 1,979.15

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Solution

The fourth proportional to 2,172.90, 3,271.10 and 1,979.15 is: 2,979.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.90 : 3,271.10 = 1,979.15 : x
  2. Step 2: Convert to fraction form
    2,172.90/3,271.10 = 1,979.15/x
  3. Step 3: Cross multiply
    2,172.90x = 3,271.10 × 1,979.15
  4. Step 4: Simplify right side
    2,172.90x = 6,474,001.57
  5. Step 5: Solve for x
    x = 6,474,001.57/2,172.90
  6. Step 6: Final answer
    x = 2,979.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.