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Finding the Fourth Proportional to 838.89, 1,257.89 and 291.03

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Solution

The fourth proportional to 838.89, 1,257.89 and 291.03 is: 436.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.89 : 1,257.89 = 291.03 : x
  2. Step 2: Convert to fraction form
    838.89/1,257.89 = 291.03/x
  3. Step 3: Cross multiply
    838.89x = 1,257.89 × 291.03
  4. Step 4: Simplify right side
    838.89x = 366,082.27
  5. Step 5: Solve for x
    x = 366,082.27/838.89
  6. Step 6: Final answer
    x = 436.39

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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.