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Finding the Fourth Proportional to 405,326.20, 606,239.70 and 342,340.60

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Solution

The fourth proportional to 405,326.20, 606,239.70 and 342,340.60 is: 512,033.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,326.20 : 606,239.70 = 342,340.60 : x
  2. Step 2: Convert to fraction form
    405,326.20/606,239.70 = 342,340.60/x
  3. Step 3: Cross multiply
    405,326.20x = 606,239.70 × 342,340.60
  4. Step 4: Simplify right side
    405,326.20x = 207,540,462,641.82
  5. Step 5: Solve for x
    x = 207,540,462,641.82/405,326.20
  6. Step 6: Final answer
    x = 512,033.18

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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.