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Finding the Fourth Proportional to 838.33, 1,257.46 and 399.26

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Solution

The fourth proportional to 838.33, 1,257.46 and 399.26 is: 598.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.33 : 1,257.46 = 399.26 : x
  2. Step 2: Convert to fraction form
    838.33/1,257.46 = 399.26/x
  3. Step 3: Cross multiply
    838.33x = 1,257.46 × 399.26
  4. Step 4: Simplify right side
    838.33x = 502,051.48
  5. Step 5: Solve for x
    x = 502,051.48/838.33
  6. Step 6: Final answer
    x = 598.87

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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.