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Finding the Fourth Proportional to 825.49, 1,236.61 and 392.95

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Solution

The fourth proportional to 825.49, 1,236.61 and 392.95 is: 588.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.49 : 1,236.61 = 392.95 : x
  2. Step 2: Convert to fraction form
    825.49/1,236.61 = 392.95/x
  3. Step 3: Cross multiply
    825.49x = 1,236.61 × 392.95
  4. Step 4: Simplify right side
    825.49x = 485,925.90
  5. Step 5: Solve for x
    x = 485,925.90/825.49
  6. Step 6: Final answer
    x = 588.65

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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.