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Finding the Fourth Proportional to 1,119.78, 1,679.37 and 389.22

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Solution

The fourth proportional to 1,119.78, 1,679.37 and 389.22 is: 583.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.78 : 1,679.37 = 389.22 : x
  2. Step 2: Convert to fraction form
    1,119.78/1,679.37 = 389.22/x
  3. Step 3: Cross multiply
    1,119.78x = 1,679.37 × 389.22
  4. Step 4: Simplify right side
    1,119.78x = 653,644.39
  5. Step 5: Solve for x
    x = 653,644.39/1,119.78
  6. Step 6: Final answer
    x = 583.73

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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.