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Finding the Fourth Proportional to 381,652.80, 571,989.60 and 213,172.80

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Solution

The fourth proportional to 381,652.80, 571,989.60 and 213,172.80 is: 319,485.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,652.80 : 571,989.60 = 213,172.80 : x
  2. Step 2: Convert to fraction form
    381,652.80/571,989.60 = 213,172.80/x
  3. Step 3: Cross multiply
    381,652.80x = 571,989.60 × 213,172.80
  4. Step 4: Simplify right side
    381,652.80x = 121,932,624,602.88
  5. Step 5: Solve for x
    x = 121,932,624,602.88/381,652.80
  6. Step 6: Final answer
    x = 319,485.73

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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.