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Finding the Fourth Proportional to 641.28, 883.80 and 612.12

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Solution

The fourth proportional to 641.28, 883.80 and 612.12 is: 843.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.28 : 883.80 = 612.12 : x
  2. Step 2: Convert to fraction form
    641.28/883.80 = 612.12/x
  3. Step 3: Cross multiply
    641.28x = 883.80 × 612.12
  4. Step 4: Simplify right side
    641.28x = 540,991.66
  5. Step 5: Solve for x
    x = 540,991.66/641.28
  6. Step 6: Final answer
    x = 843.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.