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Finding the Fourth Proportional to 572.23, 789.57 and 439.61

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Solution

The fourth proportional to 572.23, 789.57 and 439.61 is: 606.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.23 : 789.57 = 439.61 : x
  2. Step 2: Convert to fraction form
    572.23/789.57 = 439.61/x
  3. Step 3: Cross multiply
    572.23x = 789.57 × 439.61
  4. Step 4: Simplify right side
    572.23x = 347,102.87
  5. Step 5: Solve for x
    x = 347,102.87/572.23
  6. Step 6: Final answer
    x = 606.58

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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.