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Finding the Fourth Proportional to 11,915.60, 17,873.40 and 8,229.20

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Solution

The fourth proportional to 11,915.60, 17,873.40 and 8,229.20 is: 12,343.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,915.60 : 17,873.40 = 8,229.20 : x
  2. Step 2: Convert to fraction form
    11,915.60/17,873.40 = 8,229.20/x
  3. Step 3: Cross multiply
    11,915.60x = 17,873.40 × 8,229.20
  4. Step 4: Simplify right side
    11,915.60x = 147,083,783.28
  5. Step 5: Solve for x
    x = 147,083,783.28/11,915.60
  6. Step 6: Final answer
    x = 12,343.80

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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.