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Finding the Fourth Proportional to 745.36, 1,120.57 and 609.39

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Solution

The fourth proportional to 745.36, 1,120.57 and 609.39 is: 916.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.36 : 1,120.57 = 609.39 : x
  2. Step 2: Convert to fraction form
    745.36/1,120.57 = 609.39/x
  3. Step 3: Cross multiply
    745.36x = 1,120.57 × 609.39
  4. Step 4: Simplify right side
    745.36x = 682,864.15
  5. Step 5: Solve for x
    x = 682,864.15/745.36
  6. Step 6: Final answer
    x = 916.15

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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.