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Finding the Fourth Proportional to 2,636.84, 3,955.62 and 905

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Solution

The fourth proportional to 2,636.84, 3,955.62 and 905 is: 1,357.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,636.84 : 3,955.62 = 905 : x
  2. Step 2: Convert to fraction form
    2,636.84/3,955.62 = 905/x
  3. Step 3: Cross multiply
    2,636.84x = 3,955.62 × 905
  4. Step 4: Simplify right side
    2,636.84x = 3,579,836.10
  5. Step 5: Solve for x
    x = 3,579,836.10/2,636.84
  6. Step 6: Final answer
    x = 1,357.62

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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.