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Finding the Fourth Proportional to 799.97, 1,199.25 and 389.51

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Solution

The fourth proportional to 799.97, 1,199.25 and 389.51 is: 583.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.97 : 1,199.25 = 389.51 : x
  2. Step 2: Convert to fraction form
    799.97/1,199.25 = 389.51/x
  3. Step 3: Cross multiply
    799.97x = 1,199.25 × 389.51
  4. Step 4: Simplify right side
    799.97x = 467,119.87
  5. Step 5: Solve for x
    x = 467,119.87/799.97
  6. Step 6: Final answer
    x = 583.92

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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.