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Finding the Fourth Proportional to 902.18, 1,351.65 and 839

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Solution

The fourth proportional to 902.18, 1,351.65 and 839 is: 1,256.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.18 : 1,351.65 = 839 : x
  2. Step 2: Convert to fraction form
    902.18/1,351.65 = 839/x
  3. Step 3: Cross multiply
    902.18x = 1,351.65 × 839
  4. Step 4: Simplify right side
    902.18x = 1,134,034.35
  5. Step 5: Solve for x
    x = 1,134,034.35/902.18
  6. Step 6: Final answer
    x = 1,256.99

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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.