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Finding the Fourth Proportional to 906.09, 1,358.34 and 321.00

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Solution

The fourth proportional to 906.09, 1,358.34 and 321.00 is: 481.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.09 : 1,358.34 = 321.00 : x
  2. Step 2: Convert to fraction form
    906.09/1,358.34 = 321.00/x
  3. Step 3: Cross multiply
    906.09x = 1,358.34 × 321.00
  4. Step 4: Simplify right side
    906.09x = 436,020.84
  5. Step 5: Solve for x
    x = 436,020.84/906.09
  6. Step 6: Final answer
    x = 481.21

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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.