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Finding the Fourth Proportional to 13,121.16, 18,102.06 and 8,647.08

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Solution

The fourth proportional to 13,121.16, 18,102.06 and 8,647.08 is: 11,929.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.16 : 18,102.06 = 8,647.08 : x
  2. Step 2: Convert to fraction form
    13,121.16/18,102.06 = 8,647.08/x
  3. Step 3: Cross multiply
    13,121.16x = 18,102.06 × 8,647.08
  4. Step 4: Simplify right side
    13,121.16x = 156,529,960.98
  5. Step 5: Solve for x
    x = 156,529,960.98/13,121.16
  6. Step 6: Final answer
    x = 11,929.58

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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.