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Finding the Fourth Proportional to 53,929.70, 80,856.15 and 20,636.90

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Solution

The fourth proportional to 53,929.70, 80,856.15 and 20,636.90 is: 30,940.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,929.70 : 80,856.15 = 20,636.90 : x
  2. Step 2: Convert to fraction form
    53,929.70/80,856.15 = 20,636.90/x
  3. Step 3: Cross multiply
    53,929.70x = 80,856.15 × 20,636.90
  4. Step 4: Simplify right side
    53,929.70x = 1,668,620,281.94
  5. Step 5: Solve for x
    x = 1,668,620,281.94/53,929.70
  6. Step 6: Final answer
    x = 30,940.66

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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.