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Finding the Fourth Proportional to 8,906.72, 12,289.20 and 5,370.08

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Solution

The fourth proportional to 8,906.72, 12,289.20 and 5,370.08 is: 7,409.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,906.72 : 12,289.20 = 5,370.08 : x
  2. Step 2: Convert to fraction form
    8,906.72/12,289.20 = 5,370.08/x
  3. Step 3: Cross multiply
    8,906.72x = 12,289.20 × 5,370.08
  4. Step 4: Simplify right side
    8,906.72x = 65,993,987.14
  5. Step 5: Solve for x
    x = 65,993,987.14/8,906.72
  6. Step 6: Final answer
    x = 7,409.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.