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Finding the Fourth Proportional to 77,205.80, 115,808.70 and 72,021.80

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Solution

The fourth proportional to 77,205.80, 115,808.70 and 72,021.80 is: 108,032.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,205.80 : 115,808.70 = 72,021.80 : x
  2. Step 2: Convert to fraction form
    77,205.80/115,808.70 = 72,021.80/x
  3. Step 3: Cross multiply
    77,205.80x = 115,808.70 × 72,021.80
  4. Step 4: Simplify right side
    77,205.80x = 8,340,751,029.66
  5. Step 5: Solve for x
    x = 8,340,751,029.66/77,205.80
  6. Step 6: Final answer
    x = 108,032.70

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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.