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Finding the Fourth Proportional to 1,289.22, 1,933.91 and 352.31

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Solution

The fourth proportional to 1,289.22, 1,933.91 and 352.31 is: 528.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.22 : 1,933.91 = 352.31 : x
  2. Step 2: Convert to fraction form
    1,289.22/1,933.91 = 352.31/x
  3. Step 3: Cross multiply
    1,289.22x = 1,933.91 × 352.31
  4. Step 4: Simplify right side
    1,289.22x = 681,324.40
  5. Step 5: Solve for x
    x = 681,324.40/1,289.22
  6. Step 6: Final answer
    x = 528.48

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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.