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Finding the Fourth Proportional to 1,321,149,978.18, 1,980,415,968.66 and 620,387,680.68

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Solution

The fourth proportional to 1,321,149,978.18, 1,980,415,968.66 and 620,387,680.68 is: 929,966,839.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321,149,978.18 : 1,980,415,968.66 = 620,387,680.68 : x
  2. Step 2: Convert to fraction form
    1,321,149,978.18/1,980,415,968.66 = 620,387,680.68/x
  3. Step 3: Cross multiply
    1,321,149,978.18x = 1,980,415,968.66 × 620,387,680.68
  4. Step 4: Simplify right side
    1,321,149,978.18x = 1,228,625,669,578,612,992
  5. Step 5: Solve for x
    x = 1,228,625,669,578,612,992/1,321,149,978.18
  6. Step 6: Final answer
    x = 929,966,839.40

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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.