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Finding the Fourth Proportional to 3,806.74, 5,252.64 and 2,128.08

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Solution

The fourth proportional to 3,806.74, 5,252.64 and 2,128.08 is: 2,936.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,806.74 : 5,252.64 = 2,128.08 : x
  2. Step 2: Convert to fraction form
    3,806.74/5,252.64 = 2,128.08/x
  3. Step 3: Cross multiply
    3,806.74x = 5,252.64 × 2,128.08
  4. Step 4: Simplify right side
    3,806.74x = 11,178,038.13
  5. Step 5: Solve for x
    x = 11,178,038.13/3,806.74
  6. Step 6: Final answer
    x = 2,936.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.