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Finding the Fourth Proportional to 1,085.07, 1,627.35 and 426.92

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Solution

The fourth proportional to 1,085.07, 1,627.35 and 426.92 is: 640.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.07 : 1,627.35 = 426.92 : x
  2. Step 2: Convert to fraction form
    1,085.07/1,627.35 = 426.92/x
  3. Step 3: Cross multiply
    1,085.07x = 1,627.35 × 426.92
  4. Step 4: Simplify right side
    1,085.07x = 694,747.68
  5. Step 5: Solve for x
    x = 694,747.68/1,085.07
  6. Step 6: Final answer
    x = 640.28

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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.