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Finding the Fourth Proportional to 393,140.80, 589,711.20 and 168,608.80

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Solution

The fourth proportional to 393,140.80, 589,711.20 and 168,608.80 is: 252,913.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,140.80 : 589,711.20 = 168,608.80 : x
  2. Step 2: Convert to fraction form
    393,140.80/589,711.20 = 168,608.80/x
  3. Step 3: Cross multiply
    393,140.80x = 589,711.20 × 168,608.80
  4. Step 4: Simplify right side
    393,140.80x = 99,430,497,778.56
  5. Step 5: Solve for x
    x = 99,430,497,778.56/393,140.80
  6. Step 6: Final answer
    x = 252,913.20

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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.