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Finding the Fourth Proportional to 905.38, 1,357.02 and 411.26

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Solution

The fourth proportional to 905.38, 1,357.02 and 411.26 is: 616.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.38 : 1,357.02 = 411.26 : x
  2. Step 2: Convert to fraction form
    905.38/1,357.02 = 411.26/x
  3. Step 3: Cross multiply
    905.38x = 1,357.02 × 411.26
  4. Step 4: Simplify right side
    905.38x = 558,088.05
  5. Step 5: Solve for x
    x = 558,088.05/905.38
  6. Step 6: Final answer
    x = 616.41

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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.