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Finding the Fourth Proportional to 621,664,362.80, 932,244,601.80 and 212,509,905.20

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Solution

The fourth proportional to 621,664,362.80, 932,244,601.80 and 212,509,905.20 is: 318,678,733.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,664,362.80 : 932,244,601.80 = 212,509,905.20 : x
  2. Step 2: Convert to fraction form
    621,664,362.80/932,244,601.80 = 212,509,905.20/x
  3. Step 3: Cross multiply
    621,664,362.80x = 932,244,601.80 × 212,509,905.20
  4. Step 4: Simplify right side
    621,664,362.80x = 198,111,211,951,729,728
  5. Step 5: Solve for x
    x = 198,111,211,951,729,728/621,664,362.80
  6. Step 6: Final answer
    x = 318,678,733.75

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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.