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Finding the Fourth Proportional to 745.92, 1,119.56 and 380.96

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Solution

The fourth proportional to 745.92, 1,119.56 and 380.96 is: 571.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.92 : 1,119.56 = 380.96 : x
  2. Step 2: Convert to fraction form
    745.92/1,119.56 = 380.96/x
  3. Step 3: Cross multiply
    745.92x = 1,119.56 × 380.96
  4. Step 4: Simplify right side
    745.92x = 426,507.58
  5. Step 5: Solve for x
    x = 426,507.58/745.92
  6. Step 6: Final answer
    x = 571.79

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1.5x scale

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.