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Finding the Fourth Proportional to 405,209.80, 606,939.90 and 263,492.20

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Solution

The fourth proportional to 405,209.80, 606,939.90 and 263,492.20 is: 394,669.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,209.80 : 606,939.90 = 263,492.20 : x
  2. Step 2: Convert to fraction form
    405,209.80/606,939.90 = 263,492.20/x
  3. Step 3: Cross multiply
    405,209.80x = 606,939.90 × 263,492.20
  4. Step 4: Simplify right side
    405,209.80x = 159,923,929,518.78
  5. Step 5: Solve for x
    x = 159,923,929,518.78/405,209.80
  6. Step 6: Final answer
    x = 394,669.45

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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.