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Finding the Fourth Proportional to 11,139.60, 16,713.90 and 4,900.80

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Solution

The fourth proportional to 11,139.60, 16,713.90 and 4,900.80 is: 7,353.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,139.60 : 16,713.90 = 4,900.80 : x
  2. Step 2: Convert to fraction form
    11,139.60/16,713.90 = 4,900.80/x
  3. Step 3: Cross multiply
    11,139.60x = 16,713.90 × 4,900.80
  4. Step 4: Simplify right side
    11,139.60x = 81,911,481.12
  5. Step 5: Solve for x
    x = 81,911,481.12/11,139.60
  6. Step 6: Final answer
    x = 7,353.18

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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.