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Finding the Fourth Proportional to 1,221.87, 1,832.30 and 388.64

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Solution

The fourth proportional to 1,221.87, 1,832.30 and 388.64 is: 582.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.87 : 1,832.30 = 388.64 : x
  2. Step 2: Convert to fraction form
    1,221.87/1,832.30 = 388.64/x
  3. Step 3: Cross multiply
    1,221.87x = 1,832.30 × 388.64
  4. Step 4: Simplify right side
    1,221.87x = 712,105.07
  5. Step 5: Solve for x
    x = 712,105.07/1,221.87
  6. Step 6: Final answer
    x = 582.80

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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.