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Finding the Fourth Proportional to 572.70, 789.57 and 397.74

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Solution

The fourth proportional to 572.70, 789.57 and 397.74 is: 548.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.70 : 789.57 = 397.74 : x
  2. Step 2: Convert to fraction form
    572.70/789.57 = 397.74/x
  3. Step 3: Cross multiply
    572.70x = 789.57 × 397.74
  4. Step 4: Simplify right side
    572.70x = 314,043.57
  5. Step 5: Solve for x
    x = 314,043.57/572.70
  6. Step 6: Final answer
    x = 548.36

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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.