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Finding the Fourth Proportional to 745.78, 1,120.59 and 674.74

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Solution

The fourth proportional to 745.78, 1,120.59 and 674.74 is: 1,013.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.78 : 1,120.59 = 674.74 : x
  2. Step 2: Convert to fraction form
    745.78/1,120.59 = 674.74/x
  3. Step 3: Cross multiply
    745.78x = 1,120.59 × 674.74
  4. Step 4: Simplify right side
    745.78x = 756,106.90
  5. Step 5: Solve for x
    x = 756,106.90/745.78
  6. Step 6: Final answer
    x = 1,013.85

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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.