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Finding the Fourth Proportional to 72,755,381.90, 109,133,072.85 and 43,986,709.10

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Solution

The fourth proportional to 72,755,381.90, 109,133,072.85 and 43,986,709.10 is: 65,980,063.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,755,381.90 : 109,133,072.85 = 43,986,709.10 : x
  2. Step 2: Convert to fraction form
    72,755,381.90/109,133,072.85 = 43,986,709.10/x
  3. Step 3: Cross multiply
    72,755,381.90x = 109,133,072.85 × 43,986,709.10
  4. Step 4: Simplify right side
    72,755,381.90x = 4,800,404,728,642,058
  5. Step 5: Solve for x
    x = 4,800,404,728,642,058/72,755,381.90
  6. Step 6: Final answer
    x = 65,980,063.65

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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.