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Finding the Fourth Proportional to 920.70, 1,375.22 and 867.39

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Solution

The fourth proportional to 920.70, 1,375.22 and 867.39 is: 1,295.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.70 : 1,375.22 = 867.39 : x
  2. Step 2: Convert to fraction form
    920.70/1,375.22 = 867.39/x
  3. Step 3: Cross multiply
    920.70x = 1,375.22 × 867.39
  4. Step 4: Simplify right side
    920.70x = 1,192,852.08
  5. Step 5: Solve for x
    x = 1,192,852.08/920.70
  6. Step 6: Final answer
    x = 1,295.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.