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Finding the Fourth Proportional to 955.49, 1,319.23 and 641.23

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Solution

The fourth proportional to 955.49, 1,319.23 and 641.23 is: 885.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.49 : 1,319.23 = 641.23 : x
  2. Step 2: Convert to fraction form
    955.49/1,319.23 = 641.23/x
  3. Step 3: Cross multiply
    955.49x = 1,319.23 × 641.23
  4. Step 4: Simplify right side
    955.49x = 845,923.26
  5. Step 5: Solve for x
    x = 845,923.26/955.49
  6. Step 6: Final answer
    x = 885.33

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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.