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Finding the Fourth Proportional to 759.50, 1,138.51 and 389.31

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Solution

The fourth proportional to 759.50, 1,138.51 and 389.31 is: 583.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.50 : 1,138.51 = 389.31 : x
  2. Step 2: Convert to fraction form
    759.50/1,138.51 = 389.31/x
  3. Step 3: Cross multiply
    759.50x = 1,138.51 × 389.31
  4. Step 4: Simplify right side
    759.50x = 443,233.33
  5. Step 5: Solve for x
    x = 443,233.33/759.50
  6. Step 6: Final answer
    x = 583.59

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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.