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Finding the Fourth Proportional to 1,211.00, 1,816.67 and 388.99

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Solution

The fourth proportional to 1,211.00, 1,816.67 and 388.99 is: 583.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.00 : 1,816.67 = 388.99 : x
  2. Step 2: Convert to fraction form
    1,211.00/1,816.67 = 388.99/x
  3. Step 3: Cross multiply
    1,211.00x = 1,816.67 × 388.99
  4. Step 4: Simplify right side
    1,211.00x = 706,672.08
  5. Step 5: Solve for x
    x = 706,672.08/1,211.00
  6. Step 6: Final answer
    x = 583.55

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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.