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Finding the Fourth Proportional to 781.82, 1,172.69 and 319.44

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Solution

The fourth proportional to 781.82, 1,172.69 and 319.44 is: 479.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.82 : 1,172.69 = 319.44 : x
  2. Step 2: Convert to fraction form
    781.82/1,172.69 = 319.44/x
  3. Step 3: Cross multiply
    781.82x = 1,172.69 × 319.44
  4. Step 4: Simplify right side
    781.82x = 374,604.09
  5. Step 5: Solve for x
    x = 374,604.09/781.82
  6. Step 6: Final answer
    x = 479.14

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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.