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Finding the Fourth Proportional to 679.95, 1,020.21 and 371.73

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Solution

The fourth proportional to 679.95, 1,020.21 and 371.73 is: 557.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.95 : 1,020.21 = 371.73 : x
  2. Step 2: Convert to fraction form
    679.95/1,020.21 = 371.73/x
  3. Step 3: Cross multiply
    679.95x = 1,020.21 × 371.73
  4. Step 4: Simplify right side
    679.95x = 379,242.66
  5. Step 5: Solve for x
    x = 379,242.66/679.95
  6. Step 6: Final answer
    x = 557.75

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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.