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Finding the Fourth Proportional to 18,906.75, 28,364.82 and 7,816.64

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Solution

The fourth proportional to 18,906.75, 28,364.82 and 7,816.64 is: 11,726.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,906.75 : 28,364.82 = 7,816.64 : x
  2. Step 2: Convert to fraction form
    18,906.75/28,364.82 = 7,816.64/x
  3. Step 3: Cross multiply
    18,906.75x = 28,364.82 × 7,816.64
  4. Step 4: Simplify right side
    18,906.75x = 221,717,415.47
  5. Step 5: Solve for x
    x = 221,717,415.47/18,906.75
  6. Step 6: Final answer
    x = 11,726.89

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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.