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Finding the Fourth Proportional to 20,970.70, 28,940.76 and 12,019.69

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Solution

The fourth proportional to 20,970.70, 28,940.76 and 12,019.69 is: 16,587.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.70 : 28,940.76 = 12,019.69 : x
  2. Step 2: Convert to fraction form
    20,970.70/28,940.76 = 12,019.69/x
  3. Step 3: Cross multiply
    20,970.70x = 28,940.76 × 12,019.69
  4. Step 4: Simplify right side
    20,970.70x = 347,858,999.74
  5. Step 5: Solve for x
    x = 347,858,999.74/20,970.70
  6. Step 6: Final answer
    x = 16,587.86

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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.