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Finding the Fourth Proportional to 739.21, 1,108.82 and 219.22

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Solution

The fourth proportional to 739.21, 1,108.82 and 219.22 is: 328.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.21 : 1,108.82 = 219.22 : x
  2. Step 2: Convert to fraction form
    739.21/1,108.82 = 219.22/x
  3. Step 3: Cross multiply
    739.21x = 1,108.82 × 219.22
  4. Step 4: Simplify right side
    739.21x = 243,075.52
  5. Step 5: Solve for x
    x = 243,075.52/739.21
  6. Step 6: Final answer
    x = 328.83

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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.