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Finding the Fourth Proportional to 1,074.26, 1,611.39 and 380.55

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Solution

The fourth proportional to 1,074.26, 1,611.39 and 380.55 is: 570.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.26 : 1,611.39 = 380.55 : x
  2. Step 2: Convert to fraction form
    1,074.26/1,611.39 = 380.55/x
  3. Step 3: Cross multiply
    1,074.26x = 1,611.39 × 380.55
  4. Step 4: Simplify right side
    1,074.26x = 613,214.46
  5. Step 5: Solve for x
    x = 613,214.46/1,074.26
  6. Step 6: Final answer
    x = 570.83

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Double scale
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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.