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Finding the Fourth Proportional to 15,998.40, 23,997.60 and 12,657.60

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Solution

The fourth proportional to 15,998.40, 23,997.60 and 12,657.60 is: 18,986.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,998.40 : 23,997.60 = 12,657.60 : x
  2. Step 2: Convert to fraction form
    15,998.40/23,997.60 = 12,657.60/x
  3. Step 3: Cross multiply
    15,998.40x = 23,997.60 × 12,657.60
  4. Step 4: Simplify right side
    15,998.40x = 303,752,021.76
  5. Step 5: Solve for x
    x = 303,752,021.76/15,998.40
  6. Step 6: Final answer
    x = 18,986.40

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Double scale
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Similar ratio
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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.