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Finding the Fourth Proportional to 905.55, 1,358.94 and 328.43

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Solution

The fourth proportional to 905.55, 1,358.94 and 328.43 is: 492.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.55 : 1,358.94 = 328.43 : x
  2. Step 2: Convert to fraction form
    905.55/1,358.94 = 328.43/x
  3. Step 3: Cross multiply
    905.55x = 1,358.94 × 328.43
  4. Step 4: Simplify right side
    905.55x = 446,316.09
  5. Step 5: Solve for x
    x = 446,316.09/905.55
  6. Step 6: Final answer
    x = 492.86

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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.