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Finding the Fourth Proportional to 19,656.26, 27,107.85 and 12,939.40

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Solution

The fourth proportional to 19,656.26, 27,107.85 and 12,939.40 is: 17,844.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,656.26 : 27,107.85 = 12,939.40 : x
  2. Step 2: Convert to fraction form
    19,656.26/27,107.85 = 12,939.40/x
  3. Step 3: Cross multiply
    19,656.26x = 27,107.85 × 12,939.40
  4. Step 4: Simplify right side
    19,656.26x = 350,759,295.04
  5. Step 5: Solve for x
    x = 350,759,295.04/19,656.26
  6. Step 6: Final answer
    x = 17,844.67

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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.