Home / 2,231.70-3,079.74-1,287.69

Finding the Fourth Proportional to 2,231.70, 3,079.74 and 1,287.69

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Solution

The fourth proportional to 2,231.70, 3,079.74 and 1,287.69 is: 1,777.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,231.70 : 3,079.74 = 1,287.69 : x
  2. Step 2: Convert to fraction form
    2,231.70/3,079.74 = 1,287.69/x
  3. Step 3: Cross multiply
    2,231.70x = 3,079.74 × 1,287.69
  4. Step 4: Simplify right side
    2,231.70x = 3,965,750.40
  5. Step 5: Solve for x
    x = 3,965,750.40/2,231.70
  6. Step 6: Final answer
    x = 1,777.01

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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.