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Finding the Fourth Proportional to 18,814.98, 28,220.16 and 10,921.79

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Solution

The fourth proportional to 18,814.98, 28,220.16 and 10,921.79 is: 16,381.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,814.98 : 28,220.16 = 10,921.79 : x
  2. Step 2: Convert to fraction form
    18,814.98/28,220.16 = 10,921.79/x
  3. Step 3: Cross multiply
    18,814.98x = 28,220.16 × 10,921.79
  4. Step 4: Simplify right side
    18,814.98x = 308,214,520.19
  5. Step 5: Solve for x
    x = 308,214,520.19/18,814.98
  6. Step 6: Final answer
    x = 16,381.34

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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.