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Finding the Fourth Proportional to 3,806.95, 5,254.07 and 2,128.45

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Solution

The fourth proportional to 3,806.95, 5,254.07 and 2,128.45 is: 2,937.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,806.95 : 5,254.07 = 2,128.45 : x
  2. Step 2: Convert to fraction form
    3,806.95/5,254.07 = 2,128.45/x
  3. Step 3: Cross multiply
    3,806.95x = 5,254.07 × 2,128.45
  4. Step 4: Simplify right side
    3,806.95x = 11,183,032.88
  5. Step 5: Solve for x
    x = 11,183,032.88/3,806.95
  6. Step 6: Final answer
    x = 2,937.53

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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.