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Finding the Fourth Proportional to 81,662,431.80, 122,493,647.70 and 70,576,966.20

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Solution

The fourth proportional to 81,662,431.80, 122,493,647.70 and 70,576,966.20 is: 105,865,449.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,662,431.80 : 122,493,647.70 = 70,576,966.20 : x
  2. Step 2: Convert to fraction form
    81,662,431.80/122,493,647.70 = 70,576,966.20/x
  3. Step 3: Cross multiply
    81,662,431.80x = 122,493,647.70 × 70,576,966.20
  4. Step 4: Simplify right side
    81,662,431.80x = 8,645,230,033,437,608
  5. Step 5: Solve for x
    x = 8,645,230,033,437,608/81,662,431.80
  6. Step 6: Final answer
    x = 105,865,449.30

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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.