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Finding the Fourth Proportional to 905.93, 1,359.10 and 289.69

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Solution

The fourth proportional to 905.93, 1,359.10 and 289.69 is: 434.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.93 : 1,359.10 = 289.69 : x
  2. Step 2: Convert to fraction form
    905.93/1,359.10 = 289.69/x
  3. Step 3: Cross multiply
    905.93x = 1,359.10 × 289.69
  4. Step 4: Simplify right side
    905.93x = 393,709.44
  5. Step 5: Solve for x
    x = 393,709.44/905.93
  6. Step 6: Final answer
    x = 434.59

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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.