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Finding the Fourth Proportional to 381,256.68, 571,485.98 and 128,449.83

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Solution

The fourth proportional to 381,256.68, 571,485.98 and 128,449.83 is: 192,540.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,256.68 : 571,485.98 = 128,449.83 : x
  2. Step 2: Convert to fraction form
    381,256.68/571,485.98 = 128,449.83/x
  3. Step 3: Cross multiply
    381,256.68x = 571,485.98 × 128,449.83
  4. Step 4: Simplify right side
    381,256.68x = 73,407,276,336.13
  5. Step 5: Solve for x
    x = 73,407,276,336.13/381,256.68
  6. Step 6: Final answer
    x = 192,540.30

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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.