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Finding the Fourth Proportional to 381,383.98, 572,100.27 and 128,689.90

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Solution

The fourth proportional to 381,383.98, 572,100.27 and 128,689.90 is: 193,043.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,383.98 : 572,100.27 = 128,689.90 : x
  2. Step 2: Convert to fraction form
    381,383.98/572,100.27 = 128,689.90/x
  3. Step 3: Cross multiply
    381,383.98x = 572,100.27 × 128,689.90
  4. Step 4: Simplify right side
    381,383.98x = 73,623,526,536.27
  5. Step 5: Solve for x
    x = 73,623,526,536.27/381,383.98
  6. Step 6: Final answer
    x = 193,043.05

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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.