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Finding the Fourth Proportional to 14,520, 21,789.76 and 6,728.96

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Solution

The fourth proportional to 14,520, 21,789.76 and 6,728.96 is: 10,097.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,520 : 21,789.76 = 6,728.96 : x
  2. Step 2: Convert to fraction form
    14,520/21,789.76 = 6,728.96/x
  3. Step 3: Cross multiply
    14,520x = 21,789.76 × 6,728.96
  4. Step 4: Simplify right side
    14,520x = 146,622,423.45
  5. Step 5: Solve for x
    x = 146,622,423.45/14,520
  6. Step 6: Final answer
    x = 10,097.96

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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.