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Finding the Fourth Proportional to 969.86, 1,455.05 and 321.05

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Solution

The fourth proportional to 969.86, 1,455.05 and 321.05 is: 481.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.86 : 1,455.05 = 321.05 : x
  2. Step 2: Convert to fraction form
    969.86/1,455.05 = 321.05/x
  3. Step 3: Cross multiply
    969.86x = 1,455.05 × 321.05
  4. Step 4: Simplify right side
    969.86x = 467,137.33
  5. Step 5: Solve for x
    x = 467,137.33/969.86
  6. Step 6: Final answer
    x = 481.66

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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.