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Finding the Fourth Proportional to 984.06, 1,355.40 and 721.62

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Solution

The fourth proportional to 984.06, 1,355.40 and 721.62 is: 993.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    984.06 : 1,355.40 = 721.62 : x
  2. Step 2: Convert to fraction form
    984.06/1,355.40 = 721.62/x
  3. Step 3: Cross multiply
    984.06x = 1,355.40 × 721.62
  4. Step 4: Simplify right side
    984.06x = 978,083.75
  5. Step 5: Solve for x
    x = 978,083.75/984.06
  6. Step 6: Final answer
    x = 993.93

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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.