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Finding the Fourth Proportional to 3,425.84, 5,138.54 and 1,085.79

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Solution

The fourth proportional to 3,425.84, 5,138.54 and 1,085.79 is: 1,628.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,425.84 : 5,138.54 = 1,085.79 : x
  2. Step 2: Convert to fraction form
    3,425.84/5,138.54 = 1,085.79/x
  3. Step 3: Cross multiply
    3,425.84x = 5,138.54 × 1,085.79
  4. Step 4: Simplify right side
    3,425.84x = 5,579,386.03
  5. Step 5: Solve for x
    x = 5,579,386.03/3,425.84
  6. Step 6: Final answer
    x = 1,628.62

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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.