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Finding the Fourth Proportional to 988.36, 1,483.38 and 664.12

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Solution

The fourth proportional to 988.36, 1,483.38 and 664.12 is: 996.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.36 : 1,483.38 = 664.12 : x
  2. Step 2: Convert to fraction form
    988.36/1,483.38 = 664.12/x
  3. Step 3: Cross multiply
    988.36x = 1,483.38 × 664.12
  4. Step 4: Simplify right side
    988.36x = 985,142.33
  5. Step 5: Solve for x
    x = 985,142.33/988.36
  6. Step 6: Final answer
    x = 996.74

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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.