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Finding the Fourth Proportional to 205,978.60, 308,679.90 and 163,930.60

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Solution

The fourth proportional to 205,978.60, 308,679.90 and 163,930.60 is: 245,666.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,978.60 : 308,679.90 = 163,930.60 : x
  2. Step 2: Convert to fraction form
    205,978.60/308,679.90 = 163,930.60/x
  3. Step 3: Cross multiply
    205,978.60x = 308,679.90 × 163,930.60
  4. Step 4: Simplify right side
    205,978.60x = 50,602,081,214.94
  5. Step 5: Solve for x
    x = 50,602,081,214.94/205,978.60
  6. Step 6: Final answer
    x = 245,666.69

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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.