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Finding the Fourth Proportional to 205,705.80, 308,580.84 and 65,431.62

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Solution

The fourth proportional to 205,705.80, 308,580.84 and 65,431.62 is: 98,154.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,705.80 : 308,580.84 = 65,431.62 : x
  2. Step 2: Convert to fraction form
    205,705.80/308,580.84 = 65,431.62/x
  3. Step 3: Cross multiply
    205,705.80x = 308,580.84 × 65,431.62
  4. Step 4: Simplify right side
    205,705.80x = 20,190,944,262.16
  5. Step 5: Solve for x
    x = 20,190,944,262.16/205,705.80
  6. Step 6: Final answer
    x = 98,154.47

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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.