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Finding the Fourth Proportional to 3,886.61, 5,363.54 and 2,118.23

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Solution

The fourth proportional to 3,886.61, 5,363.54 and 2,118.23 is: 2,923.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,886.61 : 5,363.54 = 2,118.23 : x
  2. Step 2: Convert to fraction form
    3,886.61/5,363.54 = 2,118.23/x
  3. Step 3: Cross multiply
    3,886.61x = 5,363.54 × 2,118.23
  4. Step 4: Simplify right side
    3,886.61x = 11,361,173.93
  5. Step 5: Solve for x
    x = 11,361,173.93/3,886.61
  6. Step 6: Final answer
    x = 2,923.16

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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.