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Finding the Fourth Proportional to 745.16, 1,118.39 and 380.21

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Solution

The fourth proportional to 745.16, 1,118.39 and 380.21 is: 570.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.16 : 1,118.39 = 380.21 : x
  2. Step 2: Convert to fraction form
    745.16/1,118.39 = 380.21/x
  3. Step 3: Cross multiply
    745.16x = 1,118.39 × 380.21
  4. Step 4: Simplify right side
    745.16x = 425,215.57
  5. Step 5: Solve for x
    x = 425,215.57/745.16
  6. Step 6: Final answer
    x = 570.64

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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.