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Finding the Fourth Proportional to 18,928.20, 28,421.10 and 14,550.60

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Solution

The fourth proportional to 18,928.20, 28,421.10 and 14,550.60 is: 21,848.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928.20 : 28,421.10 = 14,550.60 : x
  2. Step 2: Convert to fraction form
    18,928.20/28,421.10 = 14,550.60/x
  3. Step 3: Cross multiply
    18,928.20x = 28,421.10 × 14,550.60
  4. Step 4: Simplify right side
    18,928.20x = 413,544,057.66
  5. Step 5: Solve for x
    x = 413,544,057.66/18,928.20
  6. Step 6: Final answer
    x = 21,848.04

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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.