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Finding the Fourth Proportional to 28,611.36, 42,917.24 and 8,889.48

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Solution

The fourth proportional to 28,611.36, 42,917.24 and 8,889.48 is: 13,334.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,611.36 : 42,917.24 = 8,889.48 : x
  2. Step 2: Convert to fraction form
    28,611.36/42,917.24 = 8,889.48/x
  3. Step 3: Cross multiply
    28,611.36x = 42,917.24 × 8,889.48
  4. Step 4: Simplify right side
    28,611.36x = 381,511,968.86
  5. Step 5: Solve for x
    x = 381,511,968.86/28,611.36
  6. Step 6: Final answer
    x = 13,334.28

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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.