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Finding the Fourth Proportional to 208,601,892.80, 312,678,890.40 and 79,159,486.40

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Solution

The fourth proportional to 208,601,892.80, 312,678,890.40 and 79,159,486.40 is: 118,654,246.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,601,892.80 : 312,678,890.40 = 79,159,486.40 : x
  2. Step 2: Convert to fraction form
    208,601,892.80/312,678,890.40 = 79,159,486.40/x
  3. Step 3: Cross multiply
    208,601,892.80x = 312,678,890.40 × 79,159,486.40
  4. Step 4: Simplify right side
    208,601,892.80x = 24,751,500,372,185,892
  5. Step 5: Solve for x
    x = 24,751,500,372,185,892/208,601,892.80
  6. Step 6: Final answer
    x = 118,654,246.33

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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.