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Finding the Fourth Proportional to 12,218.50, 16,861.62 and 6,629.50

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Solution

The fourth proportional to 12,218.50, 16,861.62 and 6,629.50 is: 9,148.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,218.50 : 16,861.62 = 6,629.50 : x
  2. Step 2: Convert to fraction form
    12,218.50/16,861.62 = 6,629.50/x
  3. Step 3: Cross multiply
    12,218.50x = 16,861.62 × 6,629.50
  4. Step 4: Simplify right side
    12,218.50x = 111,784,109.79
  5. Step 5: Solve for x
    x = 111,784,109.79/12,218.50
  6. Step 6: Final answer
    x = 9,148.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.