Home / 2,172.80-2,997.73-1,387.30

Finding the Fourth Proportional to 2,172.80, 2,997.73 and 1,387.30

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Solution

The fourth proportional to 2,172.80, 2,997.73 and 1,387.30 is: 1,914.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.80 : 2,997.73 = 1,387.30 : x
  2. Step 2: Convert to fraction form
    2,172.80/2,997.73 = 1,387.30/x
  3. Step 3: Cross multiply
    2,172.80x = 2,997.73 × 1,387.30
  4. Step 4: Simplify right side
    2,172.80x = 4,158,750.83
  5. Step 5: Solve for x
    x = 4,158,750.83/2,172.80
  6. Step 6: Final answer
    x = 1,914.01

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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.