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Finding the Fourth Proportional to 1,081.64, 1,622.46 and 432.38

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Solution

The fourth proportional to 1,081.64, 1,622.46 and 432.38 is: 648.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.64 : 1,622.46 = 432.38 : x
  2. Step 2: Convert to fraction form
    1,081.64/1,622.46 = 432.38/x
  3. Step 3: Cross multiply
    1,081.64x = 1,622.46 × 432.38
  4. Step 4: Simplify right side
    1,081.64x = 701,519.25
  5. Step 5: Solve for x
    x = 701,519.25/1,081.64
  6. Step 6: Final answer
    x = 648.57

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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.