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Finding the Fourth Proportional to 990.62, 1,366.43 and 793.79

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Solution

The fourth proportional to 990.62, 1,366.43 and 793.79 is: 1,094.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.62 : 1,366.43 = 793.79 : x
  2. Step 2: Convert to fraction form
    990.62/1,366.43 = 793.79/x
  3. Step 3: Cross multiply
    990.62x = 1,366.43 × 793.79
  4. Step 4: Simplify right side
    990.62x = 1,084,658.47
  5. Step 5: Solve for x
    x = 1,084,658.47/990.62
  6. Step 6: Final answer
    x = 1,094.93

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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.