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Finding the Fourth Proportional to 3,886.72, 5,363.65 and 2,118.32

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Solution

The fourth proportional to 3,886.72, 5,363.65 and 2,118.32 is: 2,923.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,886.72 : 5,363.65 = 2,118.32 : x
  2. Step 2: Convert to fraction form
    3,886.72/5,363.65 = 2,118.32/x
  3. Step 3: Cross multiply
    3,886.72x = 5,363.65 × 2,118.32
  4. Step 4: Simplify right side
    3,886.72x = 11,361,927.07
  5. Step 5: Solve for x
    x = 11,361,927.07/3,886.72
  6. Step 6: Final answer
    x = 2,923.27

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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.