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Finding the Fourth Proportional to 205,985.20, 308,977.80 and 72,869.80

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Solution

The fourth proportional to 205,985.20, 308,977.80 and 72,869.80 is: 109,304.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,985.20 : 308,977.80 = 72,869.80 : x
  2. Step 2: Convert to fraction form
    205,985.20/308,977.80 = 72,869.80/x
  3. Step 3: Cross multiply
    205,985.20x = 308,977.80 × 72,869.80
  4. Step 4: Simplify right side
    205,985.20x = 22,515,150,490.44
  5. Step 5: Solve for x
    x = 22,515,150,490.44/205,985.20
  6. Step 6: Final answer
    x = 109,304.70

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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.