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Finding the Fourth Proportional to 405,139.80, 606,834.90 and 263,422.20

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Solution

The fourth proportional to 405,139.80, 606,834.90 and 263,422.20 is: 394,564.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,139.80 : 606,834.90 = 263,422.20 : x
  2. Step 2: Convert to fraction form
    405,139.80/606,834.90 = 263,422.20/x
  3. Step 3: Cross multiply
    405,139.80x = 606,834.90 × 263,422.20
  4. Step 4: Simplify right side
    405,139.80x = 159,853,784,394.78
  5. Step 5: Solve for x
    x = 159,853,784,394.78/405,139.80
  6. Step 6: Final answer
    x = 394,564.50

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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.