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Finding the Fourth Proportional to 955.56, 1,318.80 and 722.28

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Solution

The fourth proportional to 955.56, 1,318.80 and 722.28 is: 996.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.56 : 1,318.80 = 722.28 : x
  2. Step 2: Convert to fraction form
    955.56/1,318.80 = 722.28/x
  3. Step 3: Cross multiply
    955.56x = 1,318.80 × 722.28
  4. Step 4: Simplify right side
    955.56x = 952,542.86
  5. Step 5: Solve for x
    x = 952,542.86/955.56
  6. Step 6: Final answer
    x = 996.84

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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.