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Finding the Fourth Proportional to 641.81, 955.37 and 611.96

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Solution

The fourth proportional to 641.81, 955.37 and 611.96 is: 910.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.81 : 955.37 = 611.96 : x
  2. Step 2: Convert to fraction form
    641.81/955.37 = 611.96/x
  3. Step 3: Cross multiply
    641.81x = 955.37 × 611.96
  4. Step 4: Simplify right side
    641.81x = 584,644.98
  5. Step 5: Solve for x
    x = 584,644.98/641.81
  6. Step 6: Final answer
    x = 910.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.