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Finding the Fourth Proportional to 12,138.85, 18,208.28 and 6,941.08

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Solution

The fourth proportional to 12,138.85, 18,208.28 and 6,941.08 is: 10,411.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.85 : 18,208.28 = 6,941.08 : x
  2. Step 2: Convert to fraction form
    12,138.85/18,208.28 = 6,941.08/x
  3. Step 3: Cross multiply
    12,138.85x = 18,208.28 × 6,941.08
  4. Step 4: Simplify right side
    12,138.85x = 126,385,128.14
  5. Step 5: Solve for x
    x = 126,385,128.14/12,138.85
  6. Step 6: Final answer
    x = 10,411.62

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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.