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Finding the Fourth Proportional to 381,299.32, 571,803.31 and 128,511.89

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Solution

The fourth proportional to 381,299.32, 571,803.31 and 128,511.89 is: 192,718.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,299.32 : 571,803.31 = 128,511.89 : x
  2. Step 2: Convert to fraction form
    381,299.32/571,803.31 = 128,511.89/x
  3. Step 3: Cross multiply
    381,299.32x = 571,803.31 × 128,511.89
  4. Step 4: Simplify right side
    381,299.32x = 73,483,524,076.36
  5. Step 5: Solve for x
    x = 73,483,524,076.36/381,299.32
  6. Step 6: Final answer
    x = 192,718.74

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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.