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Finding the Fourth Proportional to 825.72, 1,236.92 and 393.16

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Solution

The fourth proportional to 825.72, 1,236.92 and 393.16 is: 588.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.72 : 1,236.92 = 393.16 : x
  2. Step 2: Convert to fraction form
    825.72/1,236.92 = 393.16/x
  3. Step 3: Cross multiply
    825.72x = 1,236.92 × 393.16
  4. Step 4: Simplify right side
    825.72x = 486,307.47
  5. Step 5: Solve for x
    x = 486,307.47/825.72
  6. Step 6: Final answer
    x = 588.95

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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.