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Finding the Fourth Proportional to 538.50, 806.40 and 489.18

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Solution

The fourth proportional to 538.50, 806.40 and 489.18 is: 732.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.50 : 806.40 = 489.18 : x
  2. Step 2: Convert to fraction form
    538.50/806.40 = 489.18/x
  3. Step 3: Cross multiply
    538.50x = 806.40 × 489.18
  4. Step 4: Simplify right side
    538.50x = 394,474.75
  5. Step 5: Solve for x
    x = 394,474.75/538.50
  6. Step 6: Final answer
    x = 732.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.