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Finding the Fourth Proportional to 905.72, 1,358.70 and 328.54

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Solution

The fourth proportional to 905.72, 1,358.70 and 328.54 is: 492.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.72 : 1,358.70 = 328.54 : x
  2. Step 2: Convert to fraction form
    905.72/1,358.70 = 328.54/x
  3. Step 3: Cross multiply
    905.72x = 1,358.70 × 328.54
  4. Step 4: Simplify right side
    905.72x = 446,387.30
  5. Step 5: Solve for x
    x = 446,387.30/905.72
  6. Step 6: Final answer
    x = 492.85

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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.