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Finding the Fourth Proportional to 572.31, 789.48 and 439.89

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Solution

The fourth proportional to 572.31, 789.48 and 439.89 is: 606.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.31 : 789.48 = 439.89 : x
  2. Step 2: Convert to fraction form
    572.31/789.48 = 439.89/x
  3. Step 3: Cross multiply
    572.31x = 789.48 × 439.89
  4. Step 4: Simplify right side
    572.31x = 347,284.36
  5. Step 5: Solve for x
    x = 347,284.36/572.31
  6. Step 6: Final answer
    x = 606.81

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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.