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Finding the Fourth Proportional to 381,299.82, 571,804.07 and 128,512.40

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Solution

The fourth proportional to 381,299.82, 571,804.07 and 128,512.40 is: 192,719.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,299.82 : 571,804.07 = 128,512.40 : x
  2. Step 2: Convert to fraction form
    381,299.82/571,804.07 = 128,512.40/x
  3. Step 3: Cross multiply
    381,299.82x = 571,804.07 × 128,512.40
  4. Step 4: Simplify right side
    381,299.82x = 73,483,909,863.89
  5. Step 5: Solve for x
    x = 73,483,909,863.89/381,299.82
  6. Step 6: Final answer
    x = 192,719.50

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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.