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Finding the Fourth Proportional to 799.74, 1,199.79 and 312.93

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Solution

The fourth proportional to 799.74, 1,199.79 and 312.93 is: 469.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.74 : 1,199.79 = 312.93 : x
  2. Step 2: Convert to fraction form
    799.74/1,199.79 = 312.93/x
  3. Step 3: Cross multiply
    799.74x = 1,199.79 × 312.93
  4. Step 4: Simplify right side
    799.74x = 375,450.28
  5. Step 5: Solve for x
    x = 375,450.28/799.74
  6. Step 6: Final answer
    x = 469.47

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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.