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Finding the Fourth Proportional to 11,113.60, 16,621.80 and 8,489.20

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Solution

The fourth proportional to 11,113.60, 16,621.80 and 8,489.20 is: 12,696.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,113.60 : 16,621.80 = 8,489.20 : x
  2. Step 2: Convert to fraction form
    11,113.60/16,621.80 = 8,489.20/x
  3. Step 3: Cross multiply
    11,113.60x = 16,621.80 × 8,489.20
  4. Step 4: Simplify right side
    11,113.60x = 141,105,784.56
  5. Step 5: Solve for x
    x = 141,105,784.56/11,113.60
  6. Step 6: Final answer
    x = 12,696.68

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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.