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Finding the Fourth Proportional to 20,879.73, 28,815.20 and 12,386.88

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Solution

The fourth proportional to 20,879.73, 28,815.20 and 12,386.88 is: 17,094.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,879.73 : 28,815.20 = 12,386.88 : x
  2. Step 2: Convert to fraction form
    20,879.73/28,815.20 = 12,386.88/x
  3. Step 3: Cross multiply
    20,879.73x = 28,815.20 × 12,386.88
  4. Step 4: Simplify right side
    20,879.73x = 356,930,424.58
  5. Step 5: Solve for x
    x = 356,930,424.58/20,879.73
  6. Step 6: Final answer
    x = 17,094.59

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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.