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Finding the Fourth Proportional to 205,910.40, 308,836.80 and 65,683.20

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Solution

The fourth proportional to 205,910.40, 308,836.80 and 65,683.20 is: 98,515.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,910.40 : 308,836.80 = 65,683.20 : x
  2. Step 2: Convert to fraction form
    205,910.40/308,836.80 = 65,683.20/x
  3. Step 3: Cross multiply
    205,910.40x = 308,836.80 × 65,683.20
  4. Step 4: Simplify right side
    205,910.40x = 20,285,389,301.76
  5. Step 5: Solve for x
    x = 20,285,389,301.76/205,910.40
  6. Step 6: Final answer
    x = 98,515.61

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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.