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Finding the Fourth Proportional to 279,179,385.80, 418,769,078.70 and 156,735,379.40

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Solution

The fourth proportional to 279,179,385.80, 418,769,078.70 and 156,735,379.40 is: 235,103,069.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,179,385.80 : 418,769,078.70 = 156,735,379.40 : x
  2. Step 2: Convert to fraction form
    279,179,385.80/418,769,078.70 = 156,735,379.40/x
  3. Step 3: Cross multiply
    279,179,385.80x = 418,769,078.70 × 156,735,379.40
  4. Step 4: Simplify right side
    279,179,385.80x = 65,635,930,431,032,960
  5. Step 5: Solve for x
    x = 65,635,930,431,032,960/279,179,385.80
  6. Step 6: Final answer
    x = 235,103,069.10

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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.