Home / 20,972.34-28,942.47-12,021.57

Finding the Fourth Proportional to 20,972.34, 28,942.47 and 12,021.57

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Solution

The fourth proportional to 20,972.34, 28,942.47 and 12,021.57 is: 16,590.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,972.34 : 28,942.47 = 12,021.57 : x
  2. Step 2: Convert to fraction form
    20,972.34/28,942.47 = 12,021.57/x
  3. Step 3: Cross multiply
    20,972.34x = 28,942.47 × 12,021.57
  4. Step 4: Simplify right side
    20,972.34x = 347,933,929.08
  5. Step 5: Solve for x
    x = 347,933,929.08/20,972.34
  6. Step 6: Final answer
    x = 16,590.13

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1.5x scale

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.