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Finding the Fourth Proportional to 259,009.80, 388,536.69 and 72,021.30

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Solution

The fourth proportional to 259,009.80, 388,536.69 and 72,021.30 is: 108,038.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,009.80 : 388,536.69 = 72,021.30 : x
  2. Step 2: Convert to fraction form
    259,009.80/388,536.69 = 72,021.30/x
  3. Step 3: Cross multiply
    259,009.80x = 388,536.69 × 72,021.30
  4. Step 4: Simplify right side
    259,009.80x = 27,982,917,511.50
  5. Step 5: Solve for x
    x = 27,982,917,511.50/259,009.80
  6. Step 6: Final answer
    x = 108,038.06

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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.