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Finding the Fourth Proportional to 12,640.80, 18,975.60 and 7,449.60

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Solution

The fourth proportional to 12,640.80, 18,975.60 and 7,449.60 is: 11,182.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.80 : 18,975.60 = 7,449.60 : x
  2. Step 2: Convert to fraction form
    12,640.80/18,975.60 = 7,449.60/x
  3. Step 3: Cross multiply
    12,640.80x = 18,975.60 × 7,449.60
  4. Step 4: Simplify right side
    12,640.80x = 141,360,629.76
  5. Step 5: Solve for x
    x = 141,360,629.76/12,640.80
  6. Step 6: Final answer
    x = 11,182.89

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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.