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Finding the Fourth Proportional to 799.89, 1,199.82 and 313.05

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Solution

The fourth proportional to 799.89, 1,199.82 and 313.05 is: 469.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.89 : 1,199.82 = 313.05 : x
  2. Step 2: Convert to fraction form
    799.89/1,199.82 = 313.05/x
  3. Step 3: Cross multiply
    799.89x = 1,199.82 × 313.05
  4. Step 4: Simplify right side
    799.89x = 375,603.65
  5. Step 5: Solve for x
    x = 375,603.65/799.89
  6. Step 6: Final answer
    x = 469.57

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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.