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Finding the Fourth Proportional to 381,243.88, 571,699.70 and 128,477.28

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Solution

The fourth proportional to 381,243.88, 571,699.70 and 128,477.28 is: 192,659.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,243.88 : 571,699.70 = 128,477.28 : x
  2. Step 2: Convert to fraction form
    381,243.88/571,699.70 = 128,477.28/x
  3. Step 3: Cross multiply
    381,243.88x = 571,699.70 × 128,477.28
  4. Step 4: Simplify right side
    381,243.88x = 73,450,422,432.82
  5. Step 5: Solve for x
    x = 73,450,422,432.82/381,243.88
  6. Step 6: Final answer
    x = 192,659.94

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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.