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Finding the Fourth Proportional to 68,679,901.60, 103,019,852.40 and 20,804,624.80

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Solution

The fourth proportional to 68,679,901.60, 103,019,852.40 and 20,804,624.80 is: 31,206,937.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,679,901.60 : 103,019,852.40 = 20,804,624.80 : x
  2. Step 2: Convert to fraction form
    68,679,901.60/103,019,852.40 = 20,804,624.80/x
  3. Step 3: Cross multiply
    68,679,901.60x = 103,019,852.40 × 20,804,624.80
  4. Step 4: Simplify right side
    68,679,901.60x = 2,143,289,376,133,379.75
  5. Step 5: Solve for x
    x = 2,143,289,376,133,379.75/68,679,901.60
  6. Step 6: Final answer
    x = 31,206,937.20

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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.