Home / 2,106.42-2,905.91-1,221.71

Finding the Fourth Proportional to 2,106.42, 2,905.91 and 1,221.71

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Solution

The fourth proportional to 2,106.42, 2,905.91 and 1,221.71 is: 1,685.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,106.42 : 2,905.91 = 1,221.71 : x
  2. Step 2: Convert to fraction form
    2,106.42/2,905.91 = 1,221.71/x
  3. Step 3: Cross multiply
    2,106.42x = 2,905.91 × 1,221.71
  4. Step 4: Simplify right side
    2,106.42x = 3,550,175.57
  5. Step 5: Solve for x
    x = 3,550,175.57/2,106.42
  6. Step 6: Final answer
    x = 1,685.41

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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.