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Finding the Fourth Proportional to 826.27, 1,238.76 and 415.19

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Solution

The fourth proportional to 826.27, 1,238.76 and 415.19 is: 622.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.27 : 1,238.76 = 415.19 : x
  2. Step 2: Convert to fraction form
    826.27/1,238.76 = 415.19/x
  3. Step 3: Cross multiply
    826.27x = 1,238.76 × 415.19
  4. Step 4: Simplify right side
    826.27x = 514,323.86
  5. Step 5: Solve for x
    x = 514,323.86/826.27
  6. Step 6: Final answer
    x = 622.47

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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.