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Finding the Fourth Proportional to 826.56, 1,238.68 and 387.34

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Solution

The fourth proportional to 826.56, 1,238.68 and 387.34 is: 580.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.56 : 1,238.68 = 387.34 : x
  2. Step 2: Convert to fraction form
    826.56/1,238.68 = 387.34/x
  3. Step 3: Cross multiply
    826.56x = 1,238.68 × 387.34
  4. Step 4: Simplify right side
    826.56x = 479,790.31
  5. Step 5: Solve for x
    x = 479,790.31/826.56
  6. Step 6: Final answer
    x = 580.47

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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.