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Finding the Fourth Proportional to 986.89, 1,478.94 and 548.34

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Solution

The fourth proportional to 986.89, 1,478.94 and 548.34 is: 821.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.89 : 1,478.94 = 548.34 : x
  2. Step 2: Convert to fraction form
    986.89/1,478.94 = 548.34/x
  3. Step 3: Cross multiply
    986.89x = 1,478.94 × 548.34
  4. Step 4: Simplify right side
    986.89x = 810,954.56
  5. Step 5: Solve for x
    x = 810,954.56/986.89
  6. Step 6: Final answer
    x = 821.73

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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.