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Finding the Fourth Proportional to 641.20, 885.46 and 511.16

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Solution

The fourth proportional to 641.20, 885.46 and 511.16 is: 705.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.20 : 885.46 = 511.16 : x
  2. Step 2: Convert to fraction form
    641.20/885.46 = 511.16/x
  3. Step 3: Cross multiply
    641.20x = 885.46 × 511.16
  4. Step 4: Simplify right side
    641.20x = 452,611.73
  5. Step 5: Solve for x
    x = 452,611.73/641.20
  6. Step 6: Final answer
    x = 705.88

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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.