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Finding the Fourth Proportional to 572.31, 789.84 and 397.35

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Solution

The fourth proportional to 572.31, 789.84 and 397.35 is: 548.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.31 : 789.84 = 397.35 : x
  2. Step 2: Convert to fraction form
    572.31/789.84 = 397.35/x
  3. Step 3: Cross multiply
    572.31x = 789.84 × 397.35
  4. Step 4: Simplify right side
    572.31x = 313,842.92
  5. Step 5: Solve for x
    x = 313,842.92/572.31
  6. Step 6: Final answer
    x = 548.38

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Double scale
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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.