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Finding the Fourth Proportional to 205,391.80, 308,087.70 and 72,422.20

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Solution

The fourth proportional to 205,391.80, 308,087.70 and 72,422.20 is: 108,633.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,391.80 : 308,087.70 = 72,422.20 : x
  2. Step 2: Convert to fraction form
    205,391.80/308,087.70 = 72,422.20/x
  3. Step 3: Cross multiply
    205,391.80x = 308,087.70 × 72,422.20
  4. Step 4: Simplify right side
    205,391.80x = 22,312,389,026.94
  5. Step 5: Solve for x
    x = 22,312,389,026.94/205,391.80
  6. Step 6: Final answer
    x = 108,633.30

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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.