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Finding the Fourth Proportional to 1,085.22, 1,628.49 and 436

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Solution

The fourth proportional to 1,085.22, 1,628.49 and 436 is: 654.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.22 : 1,628.49 = 436 : x
  2. Step 2: Convert to fraction form
    1,085.22/1,628.49 = 436/x
  3. Step 3: Cross multiply
    1,085.22x = 1,628.49 × 436
  4. Step 4: Simplify right side
    1,085.22x = 710,021.64
  5. Step 5: Solve for x
    x = 710,021.64/1,085.22
  6. Step 6: Final answer
    x = 654.27

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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.