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Finding the Fourth Proportional to 955.37, 1,317.80 and 641.09

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Solution

The fourth proportional to 955.37, 1,317.80 and 641.09 is: 884.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.37 : 1,317.80 = 641.09 : x
  2. Step 2: Convert to fraction form
    955.37/1,317.80 = 641.09/x
  3. Step 3: Cross multiply
    955.37x = 1,317.80 × 641.09
  4. Step 4: Simplify right side
    955.37x = 844,828.40
  5. Step 5: Solve for x
    x = 844,828.40/955.37
  6. Step 6: Final answer
    x = 884.29

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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.