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Finding the Fourth Proportional to 955.25, 1,431.65 and 831.33

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Solution

The fourth proportional to 955.25, 1,431.65 and 831.33 is: 1,245.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.25 : 1,431.65 = 831.33 : x
  2. Step 2: Convert to fraction form
    955.25/1,431.65 = 831.33/x
  3. Step 3: Cross multiply
    955.25x = 1,431.65 × 831.33
  4. Step 4: Simplify right side
    955.25x = 1,190,173.59
  5. Step 5: Solve for x
    x = 1,190,173.59/955.25
  6. Step 6: Final answer
    x = 1,245.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.