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Finding the Fourth Proportional to 25,940.32, 38,915.95 and 8,408.79

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Solution

The fourth proportional to 25,940.32, 38,915.95 and 8,408.79 is: 12,614.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,940.32 : 38,915.95 = 8,408.79 : x
  2. Step 2: Convert to fraction form
    25,940.32/38,915.95 = 8,408.79/x
  3. Step 3: Cross multiply
    25,940.32x = 38,915.95 × 8,408.79
  4. Step 4: Simplify right side
    25,940.32x = 327,236,051.20
  5. Step 5: Solve for x
    x = 327,236,051.20/25,940.32
  6. Step 6: Final answer
    x = 12,614.96

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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.