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Finding the Fourth Proportional to 18,698.70, 28,048.86 and 12,129.60

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Solution

The fourth proportional to 18,698.70, 28,048.86 and 12,129.60 is: 18,194.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,698.70 : 28,048.86 = 12,129.60 : x
  2. Step 2: Convert to fraction form
    18,698.70/28,048.86 = 12,129.60/x
  3. Step 3: Cross multiply
    18,698.70x = 28,048.86 × 12,129.60
  4. Step 4: Simplify right side
    18,698.70x = 340,221,452.26
  5. Step 5: Solve for x
    x = 340,221,452.26/18,698.70
  6. Step 6: Final answer
    x = 18,194.93

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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.