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Finding the Fourth Proportional to 1,338.21, 2,007.30 and 745.61

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Solution

The fourth proportional to 1,338.21, 2,007.30 and 745.61 is: 1,118.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.21 : 2,007.30 = 745.61 : x
  2. Step 2: Convert to fraction form
    1,338.21/2,007.30 = 745.61/x
  3. Step 3: Cross multiply
    1,338.21x = 2,007.30 × 745.61
  4. Step 4: Simplify right side
    1,338.21x = 1,496,652.92
  5. Step 5: Solve for x
    x = 1,496,652.92/1,338.21
  6. Step 6: Final answer
    x = 1,118.40

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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.