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Finding the Fourth Proportional to 572.20, 789.62 and 310.21

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Solution

The fourth proportional to 572.20, 789.62 and 310.21 is: 428.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.20 : 789.62 = 310.21 : x
  2. Step 2: Convert to fraction form
    572.20/789.62 = 310.21/x
  3. Step 3: Cross multiply
    572.20x = 789.62 × 310.21
  4. Step 4: Simplify right side
    572.20x = 244,948.02
  5. Step 5: Solve for x
    x = 244,948.02/572.20
  6. Step 6: Final answer
    x = 428.08

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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.