Home / 2,172.15-2,997.34-1,287.80

Finding the Fourth Proportional to 2,172.15, 2,997.34 and 1,287.80

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Solution

The fourth proportional to 2,172.15, 2,997.34 and 1,287.80 is: 1,777.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.15 : 2,997.34 = 1,287.80 : x
  2. Step 2: Convert to fraction form
    2,172.15/2,997.34 = 1,287.80/x
  3. Step 3: Cross multiply
    2,172.15x = 2,997.34 × 1,287.80
  4. Step 4: Simplify right side
    2,172.15x = 3,859,967.49
  5. Step 5: Solve for x
    x = 3,859,967.49/2,172.15
  6. Step 6: Final answer
    x = 1,777.03

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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.