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Finding the Fourth Proportional to 1,081.75, 1,622.91 and 388.57

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Solution

The fourth proportional to 1,081.75, 1,622.91 and 388.57 is: 582.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.75 : 1,622.91 = 388.57 : x
  2. Step 2: Convert to fraction form
    1,081.75/1,622.91 = 388.57/x
  3. Step 3: Cross multiply
    1,081.75x = 1,622.91 × 388.57
  4. Step 4: Simplify right side
    1,081.75x = 630,614.14
  5. Step 5: Solve for x
    x = 630,614.14/1,081.75
  6. Step 6: Final answer
    x = 582.96

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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.