Home / 2,115.05-3,170.66-817.49

Finding the Fourth Proportional to 2,115.05, 3,170.66 and 817.49

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Solution

The fourth proportional to 2,115.05, 3,170.66 and 817.49 is: 1,225.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.05 : 3,170.66 = 817.49 : x
  2. Step 2: Convert to fraction form
    2,115.05/3,170.66 = 817.49/x
  3. Step 3: Cross multiply
    2,115.05x = 3,170.66 × 817.49
  4. Step 4: Simplify right side
    2,115.05x = 2,591,978.76
  5. Step 5: Solve for x
    x = 2,591,978.76/2,115.05
  6. Step 6: Final answer
    x = 1,225.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.