Home / 20,972.78-28,943.62-12,021.77

Finding the Fourth Proportional to 20,972.78, 28,943.62 and 12,021.77

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Solution

The fourth proportional to 20,972.78, 28,943.62 and 12,021.77 is: 16,590.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.78 : 28,943.62 = 12,021.77 : x
  2. Step 2: Convert to fraction form
    20,972.78/28,943.62 = 12,021.77/x
  3. Step 3: Cross multiply
    20,972.78x = 28,943.62 × 12,021.77
  4. Step 4: Simplify right side
    20,972.78x = 347,953,397.89
  5. Step 5: Solve for x
    x = 347,953,397.89/20,972.78
  6. Step 6: Final answer
    x = 16,590.72

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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.