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Finding the Fourth Proportional to 572.21, 789.05 and 489.59

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Solution

The fourth proportional to 572.21, 789.05 and 489.59 is: 675.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.21 : 789.05 = 489.59 : x
  2. Step 2: Convert to fraction form
    572.21/789.05 = 489.59/x
  3. Step 3: Cross multiply
    572.21x = 789.05 × 489.59
  4. Step 4: Simplify right side
    572.21x = 386,304.60
  5. Step 5: Solve for x
    x = 386,304.60/572.21
  6. Step 6: Final answer
    x = 675.12

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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.