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Finding the Fourth Proportional to 1,085.82, 1,628.94 and 392.58

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Solution

The fourth proportional to 1,085.82, 1,628.94 and 392.58 is: 588.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.82 : 1,628.94 = 392.58 : x
  2. Step 2: Convert to fraction form
    1,085.82/1,628.94 = 392.58/x
  3. Step 3: Cross multiply
    1,085.82x = 1,628.94 × 392.58
  4. Step 4: Simplify right side
    1,085.82x = 639,489.27
  5. Step 5: Solve for x
    x = 639,489.27/1,085.82
  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.