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Finding the Fourth Proportional to 990.80, 1,483.96 and 817.05

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Solution

The fourth proportional to 990.80, 1,483.96 and 817.05 is: 1,223.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.80 : 1,483.96 = 817.05 : x
  2. Step 2: Convert to fraction form
    990.80/1,483.96 = 817.05/x
  3. Step 3: Cross multiply
    990.80x = 1,483.96 × 817.05
  4. Step 4: Simplify right side
    990.80x = 1,212,469.52
  5. Step 5: Solve for x
    x = 1,212,469.52/990.80
  6. Step 6: Final answer
    x = 1,223.73

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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.