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Finding the Fourth Proportional to 11,438.78, 17,120.07 and 8,650.08

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Solution

The fourth proportional to 11,438.78, 17,120.07 and 8,650.08 is: 12,946.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,438.78 : 17,120.07 = 8,650.08 : x
  2. Step 2: Convert to fraction form
    11,438.78/17,120.07 = 8,650.08/x
  3. Step 3: Cross multiply
    11,438.78x = 17,120.07 × 8,650.08
  4. Step 4: Simplify right side
    11,438.78x = 148,089,975.11
  5. Step 5: Solve for x
    x = 148,089,975.11/11,438.78
  6. Step 6: Final answer
    x = 12,946.31

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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.