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Finding the Fourth Proportional to 1,085.44, 1,628.30 and 392.02

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Solution

The fourth proportional to 1,085.44, 1,628.30 and 392.02 is: 588.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.44 : 1,628.30 = 392.02 : x
  2. Step 2: Convert to fraction form
    1,085.44/1,628.30 = 392.02/x
  3. Step 3: Cross multiply
    1,085.44x = 1,628.30 × 392.02
  4. Step 4: Simplify right side
    1,085.44x = 638,324.21
  5. Step 5: Solve for x
    x = 638,324.21/1,085.44
  6. Step 6: Final answer
    x = 588.08

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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.