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Finding the Fourth Proportional to 745.11, 1,120.20 and 609.14

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Solution

The fourth proportional to 745.11, 1,120.20 and 609.14 is: 915.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.11 : 1,120.20 = 609.14 : x
  2. Step 2: Convert to fraction form
    745.11/1,120.20 = 609.14/x
  3. Step 3: Cross multiply
    745.11x = 1,120.20 × 609.14
  4. Step 4: Simplify right side
    745.11x = 682,355.58
  5. Step 5: Solve for x
    x = 682,355.58/745.11
  6. Step 6: Final answer
    x = 915.78

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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.