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Finding the Fourth Proportional to 759.21, 1,139.09 and 369.20

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Solution

The fourth proportional to 759.21, 1,139.09 and 369.20 is: 553.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.21 : 1,139.09 = 369.20 : x
  2. Step 2: Convert to fraction form
    759.21/1,139.09 = 369.20/x
  3. Step 3: Cross multiply
    759.21x = 1,139.09 × 369.20
  4. Step 4: Simplify right side
    759.21x = 420,544.49
  5. Step 5: Solve for x
    x = 420,544.49/759.21
  6. Step 6: Final answer
    x = 553.92

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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.