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Finding the Fourth Proportional to 381,659.45, 572,489.24 and 128,940.66

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Solution

The fourth proportional to 381,659.45, 572,489.24 and 128,940.66 is: 193,411.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,659.45 : 572,489.24 = 128,940.66 : x
  2. Step 2: Convert to fraction form
    381,659.45/572,489.24 = 128,940.66/x
  3. Step 3: Cross multiply
    381,659.45x = 572,489.24 × 128,940.66
  4. Step 4: Simplify right side
    381,659.45x = 73,817,139,803.80
  5. Step 5: Solve for x
    x = 73,817,139,803.80/381,659.45
  6. Step 6: Final answer
    x = 193,411.01

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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.