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Finding the Fourth Proportional to 253,693,999.80, 380,540,999.70 and 81,176,441.40

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Solution

The fourth proportional to 253,693,999.80, 380,540,999.70 and 81,176,441.40 is: 121,764,662.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    253,693,999.80 : 380,540,999.70 = 81,176,441.40 : x
  2. Step 2: Convert to fraction form
    253,693,999.80/380,540,999.70 = 81,176,441.40/x
  3. Step 3: Cross multiply
    253,693,999.80x = 380,540,999.70 × 81,176,441.40
  4. Step 4: Simplify right side
    253,693,999.80x = 30,890,964,162,444,468
  5. Step 5: Solve for x
    x = 30,890,964,162,444,468/253,693,999.80
  6. Step 6: Final answer
    x = 121,764,662.10

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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.