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Finding the Fourth Proportional to 405,021.80, 606,657.90 and 217,814.60

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Solution

The fourth proportional to 405,021.80, 606,657.90 and 217,814.60 is: 326,251.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,021.80 : 606,657.90 = 217,814.60 : x
  2. Step 2: Convert to fraction form
    405,021.80/606,657.90 = 217,814.60/x
  3. Step 3: Cross multiply
    405,021.80x = 606,657.90 × 217,814.60
  4. Step 4: Simplify right side
    405,021.80x = 132,138,947,825.34
  5. Step 5: Solve for x
    x = 132,138,947,825.34/405,021.80
  6. Step 6: Final answer
    x = 326,251.45

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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.