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Finding the Fourth Proportional to 218,728,913.80, 328,093,370.70 and 215,327,691.40

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Solution

The fourth proportional to 218,728,913.80, 328,093,370.70 and 215,327,691.40 is: 322,991,537.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,728,913.80 : 328,093,370.70 = 215,327,691.40 : x
  2. Step 2: Convert to fraction form
    218,728,913.80/328,093,370.70 = 215,327,691.40/x
  3. Step 3: Cross multiply
    218,728,913.80x = 328,093,370.70 × 215,327,691.40
  4. Step 4: Simplify right side
    218,728,913.80x = 70,647,588,076,475,400
  5. Step 5: Solve for x
    x = 70,647,588,076,475,400/218,728,913.80
  6. Step 6: Final answer
    x = 322,991,537.10

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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.