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Finding the Fourth Proportional to 259,855,661.72, 389,807,452.74 and 84,979,602.80

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Solution

The fourth proportional to 259,855,661.72, 389,807,452.74 and 84,979,602.80 is: 127,477,239.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,855,661.72 : 389,807,452.74 = 84,979,602.80 : x
  2. Step 2: Convert to fraction form
    259,855,661.72/389,807,452.74 = 84,979,602.80/x
  3. Step 3: Cross multiply
    259,855,661.72x = 389,807,452.74 × 84,979,602.80
  4. Step 4: Simplify right side
    259,855,661.72x = 33,125,682,502,324,972
  5. Step 5: Solve for x
    x = 33,125,682,502,324,972/259,855,661.72
  6. Step 6: Final answer
    x = 127,477,239.80

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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.