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Finding the Fourth Proportional to 25,940.61, 38,916.60 and 8,412.21

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Solution

The fourth proportional to 25,940.61, 38,916.60 and 8,412.21 is: 12,620.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,940.61 : 38,916.60 = 8,412.21 : x
  2. Step 2: Convert to fraction form
    25,940.61/38,916.60 = 8,412.21/x
  3. Step 3: Cross multiply
    25,940.61x = 38,916.60 × 8,412.21
  4. Step 4: Simplify right side
    25,940.61x = 327,374,611.69
  5. Step 5: Solve for x
    x = 327,374,611.69/25,940.61
  6. Step 6: Final answer
    x = 12,620.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.