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Finding the Fourth Proportional to 205,140.80, 307,711.20 and 163,668.80

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Solution

The fourth proportional to 205,140.80, 307,711.20 and 163,668.80 is: 245,503.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,140.80 : 307,711.20 = 163,668.80 : x
  2. Step 2: Convert to fraction form
    205,140.80/307,711.20 = 163,668.80/x
  3. Step 3: Cross multiply
    205,140.80x = 307,711.20 × 163,668.80
  4. Step 4: Simplify right side
    205,140.80x = 50,362,722,850.56
  5. Step 5: Solve for x
    x = 50,362,722,850.56/205,140.80
  6. Step 6: Final answer
    x = 245,503.20

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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.