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Finding the Fourth Proportional to 3,886.96, 5,363.98 and 2,118.64

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Solution

The fourth proportional to 3,886.96, 5,363.98 and 2,118.64 is: 2,923.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,886.96 : 5,363.98 = 2,118.64 : x
  2. Step 2: Convert to fraction form
    3,886.96/5,363.98 = 2,118.64/x
  3. Step 3: Cross multiply
    3,886.96x = 5,363.98 × 2,118.64
  4. Step 4: Simplify right side
    3,886.96x = 11,364,342.59
  5. Step 5: Solve for x
    x = 11,364,342.59/3,886.96
  6. Step 6: Final answer
    x = 2,923.71

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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.