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Finding the Fourth Proportional to 905.64, 1,357.98 and 289.09

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Solution

The fourth proportional to 905.64, 1,357.98 and 289.09 is: 433.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.64 : 1,357.98 = 289.09 : x
  2. Step 2: Convert to fraction form
    905.64/1,357.98 = 289.09/x
  3. Step 3: Cross multiply
    905.64x = 1,357.98 × 289.09
  4. Step 4: Simplify right side
    905.64x = 392,578.44
  5. Step 5: Solve for x
    x = 392,578.44/905.64
  6. Step 6: Final answer
    x = 433.48

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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.