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Finding the Fourth Proportional to 745.73, 1,118.72 and 380.33

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Solution

The fourth proportional to 745.73, 1,118.72 and 380.33 is: 570.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.73 : 1,118.72 = 380.33 : x
  2. Step 2: Convert to fraction form
    745.73/1,118.72 = 380.33/x
  3. Step 3: Cross multiply
    745.73x = 1,118.72 × 380.33
  4. Step 4: Simplify right side
    745.73x = 425,475.28
  5. Step 5: Solve for x
    x = 425,475.28/745.73
  6. Step 6: Final answer
    x = 570.55

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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.