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Finding the Fourth Proportional to 799.34, 1,199.14 and 388.40

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Solution

The fourth proportional to 799.34, 1,199.14 and 388.40 is: 582.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.34 : 1,199.14 = 388.40 : x
  2. Step 2: Convert to fraction form
    799.34/1,199.14 = 388.40/x
  3. Step 3: Cross multiply
    799.34x = 1,199.14 × 388.40
  4. Step 4: Simplify right side
    799.34x = 465,739.01
  5. Step 5: Solve for x
    x = 465,739.01/799.34
  6. Step 6: Final answer
    x = 582.66

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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.