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Finding the Fourth Proportional to 745.88, 1,118.31 and 329.21

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Solution

The fourth proportional to 745.88, 1,118.31 and 329.21 is: 493.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.88 : 1,118.31 = 329.21 : x
  2. Step 2: Convert to fraction form
    745.88/1,118.31 = 329.21/x
  3. Step 3: Cross multiply
    745.88x = 1,118.31 × 329.21
  4. Step 4: Simplify right side
    745.88x = 368,158.84
  5. Step 5: Solve for x
    x = 368,158.84/745.88
  6. Step 6: Final answer
    x = 493.59

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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.