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Finding the Fourth Proportional to 12,245.90, 18,378.45 and 5,672.90

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Solution

The fourth proportional to 12,245.90, 18,378.45 and 5,672.90 is: 8,513.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,245.90 : 18,378.45 = 5,672.90 : x
  2. Step 2: Convert to fraction form
    12,245.90/18,378.45 = 5,672.90/x
  3. Step 3: Cross multiply
    12,245.90x = 18,378.45 × 5,672.90
  4. Step 4: Simplify right side
    12,245.90x = 104,259,109.01
  5. Step 5: Solve for x
    x = 104,259,109.01/12,245.90
  6. Step 6: Final answer
    x = 8,513.80

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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.