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Finding the Fourth Proportional to 782.22, 1,172.60 and 349.14

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Solution

The fourth proportional to 782.22, 1,172.60 and 349.14 is: 523.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.22 : 1,172.60 = 349.14 : x
  2. Step 2: Convert to fraction form
    782.22/1,172.60 = 349.14/x
  3. Step 3: Cross multiply
    782.22x = 1,172.60 × 349.14
  4. Step 4: Simplify right side
    782.22x = 409,401.56
  5. Step 5: Solve for x
    x = 409,401.56/782.22
  6. Step 6: Final answer
    x = 523.38

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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.