Home / 20,972.70-28,943.52-12,021.69

Finding the Fourth Proportional to 20,972.70, 28,943.52 and 12,021.69

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Solution

The fourth proportional to 20,972.70, 28,943.52 and 12,021.69 is: 16,590.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.70 : 28,943.52 = 12,021.69 : x
  2. Step 2: Convert to fraction form
    20,972.70/28,943.52 = 12,021.69/x
  3. Step 3: Cross multiply
    20,972.70x = 28,943.52 × 12,021.69
  4. Step 4: Simplify right side
    20,972.70x = 347,950,024.95
  5. Step 5: Solve for x
    x = 347,950,024.95/20,972.70
  6. Step 6: Final answer
    x = 16,590.62

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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.