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Finding the Fourth Proportional to 279,939,774.40, 419,909,661.60 and 221,489,137.60

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Solution

The fourth proportional to 279,939,774.40, 419,909,661.60 and 221,489,137.60 is: 332,233,706.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,939,774.40 : 419,909,661.60 = 221,489,137.60 : x
  2. Step 2: Convert to fraction form
    279,939,774.40/419,909,661.60 = 221,489,137.60/x
  3. Step 3: Cross multiply
    279,939,774.40x = 419,909,661.60 × 221,489,137.60
  4. Step 4: Simplify right side
    279,939,774.40x = 93,005,428,817,691,840
  5. Step 5: Solve for x
    x = 93,005,428,817,691,840/279,939,774.40
  6. Step 6: Final answer
    x = 332,233,706.40

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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.