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Finding the Fourth Proportional to 381,635.40, 572,519.08 and 128,917.74

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Solution

The fourth proportional to 381,635.40, 572,519.08 and 128,917.74 is: 193,398.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,635.40 : 572,519.08 = 128,917.74 : x
  2. Step 2: Convert to fraction form
    381,635.40/572,519.08 = 128,917.74/x
  3. Step 3: Cross multiply
    381,635.40x = 572,519.08 × 128,917.74
  4. Step 4: Simplify right side
    381,635.40x = 73,807,865,900.48
  5. Step 5: Solve for x
    x = 73,807,865,900.48/381,635.40
  6. Step 6: Final answer
    x = 193,398.90

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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.