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Finding the Fourth Proportional to 874.62, 1,205.80 and 749.74

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Solution

The fourth proportional to 874.62, 1,205.80 and 749.74 is: 1,033.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.62 : 1,205.80 = 749.74 : x
  2. Step 2: Convert to fraction form
    874.62/1,205.80 = 749.74/x
  3. Step 3: Cross multiply
    874.62x = 1,205.80 × 749.74
  4. Step 4: Simplify right side
    874.62x = 904,036.49
  5. Step 5: Solve for x
    x = 904,036.49/874.62
  6. Step 6: Final answer
    x = 1,033.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.