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Finding the Fourth Proportional to 1,319,179,990.40, 1,978,266,100.80 and 398,750,422.40

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Solution

The fourth proportional to 1,319,179,990.40, 1,978,266,100.80 and 398,750,422.40 is: 597,973,323.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,179,990.40 : 1,978,266,100.80 = 398,750,422.40 : x
  2. Step 2: Convert to fraction form
    1,319,179,990.40/1,978,266,100.80 = 398,750,422.40/x
  3. Step 3: Cross multiply
    1,319,179,990.40x = 1,978,266,100.80 × 398,750,422.40
  4. Step 4: Simplify right side
    1,319,179,990.40x = 788,834,443,313,600,896
  5. Step 5: Solve for x
    x = 788,834,443,313,600,896/1,319,179,990.40
  6. Step 6: Final answer
    x = 597,973,323.62

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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.