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Finding the Fourth Proportional to 572.72, 789.12 and 397.76

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Solution

The fourth proportional to 572.72, 789.12 and 397.76 is: 548.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.72 : 789.12 = 397.76 : x
  2. Step 2: Convert to fraction form
    572.72/789.12 = 397.76/x
  3. Step 3: Cross multiply
    572.72x = 789.12 × 397.76
  4. Step 4: Simplify right side
    572.72x = 313,880.37
  5. Step 5: Solve for x
    x = 313,880.37/572.72
  6. Step 6: Final answer
    x = 548.05

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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.