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Finding the Fourth Proportional to 20,675, 28,533.61 and 12,179.79

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Solution

The fourth proportional to 20,675, 28,533.61 and 12,179.79 is: 16,809.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,675 : 28,533.61 = 12,179.79 : x
  2. Step 2: Convert to fraction form
    20,675/28,533.61 = 12,179.79/x
  3. Step 3: Cross multiply
    20,675x = 28,533.61 × 12,179.79
  4. Step 4: Simplify right side
    20,675x = 347,533,377.74
  5. Step 5: Solve for x
    x = 347,533,377.74/20,675
  6. Step 6: Final answer
    x = 16,809.35

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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.