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Finding the Fourth Proportional to 745.05, 1,115.82 and 378.93

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Solution

The fourth proportional to 745.05, 1,115.82 and 378.93 is: 567.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.05 : 1,115.82 = 378.93 : x
  2. Step 2: Convert to fraction form
    745.05/1,115.82 = 378.93/x
  3. Step 3: Cross multiply
    745.05x = 1,115.82 × 378.93
  4. Step 4: Simplify right side
    745.05x = 422,817.67
  5. Step 5: Solve for x
    x = 422,817.67/745.05
  6. Step 6: Final answer
    x = 567.50

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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.