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Finding the Fourth Proportional to 955.75, 1,442.23 and 921.43

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Solution

The fourth proportional to 955.75, 1,442.23 and 921.43 is: 1,390.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.75 : 1,442.23 = 921.43 : x
  2. Step 2: Convert to fraction form
    955.75/1,442.23 = 921.43/x
  3. Step 3: Cross multiply
    955.75x = 1,442.23 × 921.43
  4. Step 4: Simplify right side
    955.75x = 1,328,907.97
  5. Step 5: Solve for x
    x = 1,328,907.97/955.75
  6. Step 6: Final answer
    x = 1,390.44

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.