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Finding the Fourth Proportional to 18,709.20, 28,063.80 and 12,877.20

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Solution

The fourth proportional to 18,709.20, 28,063.80 and 12,877.20 is: 19,315.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,709.20 : 28,063.80 = 12,877.20 : x
  2. Step 2: Convert to fraction form
    18,709.20/28,063.80 = 12,877.20/x
  3. Step 3: Cross multiply
    18,709.20x = 28,063.80 × 12,877.20
  4. Step 4: Simplify right side
    18,709.20x = 361,383,165.36
  5. Step 5: Solve for x
    x = 361,383,165.36/18,709.20
  6. Step 6: Final answer
    x = 19,315.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.