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Finding the Fourth Proportional to 12,661.90, 18,999.60 and 4,769.80

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Solution

The fourth proportional to 12,661.90, 18,999.60 and 4,769.80 is: 7,157.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661.90 : 18,999.60 = 4,769.80 : x
  2. Step 2: Convert to fraction form
    12,661.90/18,999.60 = 4,769.80/x
  3. Step 3: Cross multiply
    12,661.90x = 18,999.60 × 4,769.80
  4. Step 4: Simplify right side
    12,661.90x = 90,624,292.08
  5. Step 5: Solve for x
    x = 90,624,292.08/12,661.90
  6. Step 6: Final answer
    x = 7,157.24

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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.