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Finding the Fourth Proportional to 205,389.40, 308,084.10 and 72,419.80

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Solution

The fourth proportional to 205,389.40, 308,084.10 and 72,419.80 is: 108,629.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,389.40 : 308,084.10 = 72,419.80 : x
  2. Step 2: Convert to fraction form
    205,389.40/308,084.10 = 72,419.80/x
  3. Step 3: Cross multiply
    205,389.40x = 308,084.10 × 72,419.80
  4. Step 4: Simplify right side
    205,389.40x = 22,311,388,905.18
  5. Step 5: Solve for x
    x = 22,311,388,905.18/205,389.40
  6. Step 6: Final answer
    x = 108,629.70

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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.