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Finding the Fourth Proportional to 990.96, 1,367.50 and 548.83

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Solution

The fourth proportional to 990.96, 1,367.50 and 548.83 is: 757.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.96 : 1,367.50 = 548.83 : x
  2. Step 2: Convert to fraction form
    990.96/1,367.50 = 548.83/x
  3. Step 3: Cross multiply
    990.96x = 1,367.50 × 548.83
  4. Step 4: Simplify right side
    990.96x = 750,525.03
  5. Step 5: Solve for x
    x = 750,525.03/990.96
  6. Step 6: Final answer
    x = 757.37

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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.