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Finding the Fourth Proportional to 259,039.80, 388,559.70 and 72,051.30

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Solution

The fourth proportional to 259,039.80, 388,559.70 and 72,051.30 is: 108,076.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,039.80 : 388,559.70 = 72,051.30 : x
  2. Step 2: Convert to fraction form
    259,039.80/388,559.70 = 72,051.30/x
  3. Step 3: Cross multiply
    259,039.80x = 388,559.70 × 72,051.30
  4. Step 4: Simplify right side
    259,039.80x = 27,996,231,512.61
  5. Step 5: Solve for x
    x = 27,996,231,512.61/259,039.80
  6. Step 6: Final answer
    x = 108,076.95

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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.