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Finding the Fourth Proportional to 3,886.85, 5,328.84 and 3,816.90

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Solution

The fourth proportional to 3,886.85, 5,328.84 and 3,816.90 is: 5,232.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,886.85 : 5,328.84 = 3,816.90 : x
  2. Step 2: Convert to fraction form
    3,886.85/5,328.84 = 3,816.90/x
  3. Step 3: Cross multiply
    3,886.85x = 5,328.84 × 3,816.90
  4. Step 4: Simplify right side
    3,886.85x = 20,339,649.40
  5. Step 5: Solve for x
    x = 20,339,649.40/3,886.85
  6. Step 6: Final answer
    x = 5,232.95

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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.