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Finding the Fourth Proportional to 13,859.35, 20,768.88 and 7,917.91

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Solution

The fourth proportional to 13,859.35, 20,768.88 and 7,917.91 is: 11,865.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,859.35 : 20,768.88 = 7,917.91 : x
  2. Step 2: Convert to fraction form
    13,859.35/20,768.88 = 7,917.91/x
  3. Step 3: Cross multiply
    13,859.35x = 20,768.88 × 7,917.91
  4. Step 4: Simplify right side
    13,859.35x = 164,446,122.64
  5. Step 5: Solve for x
    x = 164,446,122.64/13,859.35
  6. Step 6: Final answer
    x = 11,865.36

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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.