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Finding the Fourth Proportional to 641.82, 886.26 and 621.18

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Solution

The fourth proportional to 641.82, 886.26 and 621.18 is: 857.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.82 : 886.26 = 621.18 : x
  2. Step 2: Convert to fraction form
    641.82/886.26 = 621.18/x
  3. Step 3: Cross multiply
    641.82x = 886.26 × 621.18
  4. Step 4: Simplify right side
    641.82x = 550,526.99
  5. Step 5: Solve for x
    x = 550,526.99/641.82
  6. Step 6: Final answer
    x = 857.76

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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.