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Finding the Fourth Proportional to 3,876.84, 5,315.16 and 3,806.64

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Solution

The fourth proportional to 3,876.84, 5,315.16 and 3,806.64 is: 5,218.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,876.84 : 5,315.16 = 3,806.64 : x
  2. Step 2: Convert to fraction form
    3,876.84/5,315.16 = 3,806.64/x
  3. Step 3: Cross multiply
    3,876.84x = 5,315.16 × 3,806.64
  4. Step 4: Simplify right side
    3,876.84x = 20,232,900.66
  5. Step 5: Solve for x
    x = 20,232,900.66/3,876.84
  6. Step 6: Final answer
    x = 5,218.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.