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Finding the Fourth Proportional to 838.09, 1,257.27 and 290.35

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Solution

The fourth proportional to 838.09, 1,257.27 and 290.35 is: 435.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.09 : 1,257.27 = 290.35 : x
  2. Step 2: Convert to fraction form
    838.09/1,257.27 = 290.35/x
  3. Step 3: Cross multiply
    838.09x = 1,257.27 × 290.35
  4. Step 4: Simplify right side
    838.09x = 365,048.34
  5. Step 5: Solve for x
    x = 365,048.34/838.09
  6. Step 6: Final answer
    x = 435.57

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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.