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Finding the Fourth Proportional to 21,858.59, 30,163.97 and 12,298.67

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Solution

The fourth proportional to 21,858.59, 30,163.97 and 12,298.67 is: 16,971.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,858.59 : 30,163.97 = 12,298.67 : x
  2. Step 2: Convert to fraction form
    21,858.59/30,163.97 = 12,298.67/x
  3. Step 3: Cross multiply
    21,858.59x = 30,163.97 × 12,298.67
  4. Step 4: Simplify right side
    21,858.59x = 370,976,819.08
  5. Step 5: Solve for x
    x = 370,976,819.08/21,858.59
  6. Step 6: Final answer
    x = 16,971.68

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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.