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Finding the Fourth Proportional to 745.04, 1,115.83 and 378.94

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Solution

The fourth proportional to 745.04, 1,115.83 and 378.94 is: 567.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.04 : 1,115.83 = 378.94 : x
  2. Step 2: Convert to fraction form
    745.04/1,115.83 = 378.94/x
  3. Step 3: Cross multiply
    745.04x = 1,115.83 × 378.94
  4. Step 4: Simplify right side
    745.04x = 422,832.62
  5. Step 5: Solve for x
    x = 422,832.62/745.04
  6. Step 6: Final answer
    x = 567.53

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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.