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Finding the Fourth Proportional to 12,243.20, 18,364.80 and 7,865.60

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Solution

The fourth proportional to 12,243.20, 18,364.80 and 7,865.60 is: 11,798.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,243.20 : 18,364.80 = 7,865.60 : x
  2. Step 2: Convert to fraction form
    12,243.20/18,364.80 = 7,865.60/x
  3. Step 3: Cross multiply
    12,243.20x = 18,364.80 × 7,865.60
  4. Step 4: Simplify right side
    12,243.20x = 144,450,170.88
  5. Step 5: Solve for x
    x = 144,450,170.88/12,243.20
  6. Step 6: Final answer
    x = 11,798.40

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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.