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Finding the Fourth Proportional to 3,313, 4,969.86 and 1,261

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Solution

The fourth proportional to 3,313, 4,969.86 and 1,261 is: 1,891.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,313 : 4,969.86 = 1,261 : x
  2. Step 2: Convert to fraction form
    3,313/4,969.86 = 1,261/x
  3. Step 3: Cross multiply
    3,313x = 4,969.86 × 1,261
  4. Step 4: Simplify right side
    3,313x = 6,266,993.46
  5. Step 5: Solve for x
    x = 6,266,993.46/3,313
  6. Step 6: Final answer
    x = 1,891.64

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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.