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Finding the Fourth Proportional to 1,209.75, 1,814.49 and 388.62

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Solution

The fourth proportional to 1,209.75, 1,814.49 and 388.62 is: 582.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.75 : 1,814.49 = 388.62 : x
  2. Step 2: Convert to fraction form
    1,209.75/1,814.49 = 388.62/x
  3. Step 3: Cross multiply
    1,209.75x = 1,814.49 × 388.62
  4. Step 4: Simplify right side
    1,209.75x = 705,147.10
  5. Step 5: Solve for x
    x = 705,147.10/1,209.75
  6. Step 6: Final answer
    x = 582.89

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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.