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Finding the Fourth Proportional to 12,636.80, 18,969.60 and 7,445.60

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Solution

The fourth proportional to 12,636.80, 18,969.60 and 7,445.60 is: 11,176.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,636.80 : 18,969.60 = 7,445.60 : x
  2. Step 2: Convert to fraction form
    12,636.80/18,969.60 = 7,445.60/x
  3. Step 3: Cross multiply
    12,636.80x = 18,969.60 × 7,445.60
  4. Step 4: Simplify right side
    12,636.80x = 141,240,053.76
  5. Step 5: Solve for x
    x = 141,240,053.76/12,636.80
  6. Step 6: Final answer
    x = 11,176.88

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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.