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Finding the Fourth Proportional to 825.96, 1,238.40 and 415.32

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Solution

The fourth proportional to 825.96, 1,238.40 and 415.32 is: 622.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.96 : 1,238.40 = 415.32 : x
  2. Step 2: Convert to fraction form
    825.96/1,238.40 = 415.32/x
  3. Step 3: Cross multiply
    825.96x = 1,238.40 × 415.32
  4. Step 4: Simplify right side
    825.96x = 514,332.29
  5. Step 5: Solve for x
    x = 514,332.29/825.96
  6. Step 6: Final answer
    x = 622.71

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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.