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Finding the Fourth Proportional to 955.12, 1,318.12 and 721.84

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Solution

The fourth proportional to 955.12, 1,318.12 and 721.84 is: 996.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.12 : 1,318.12 = 721.84 : x
  2. Step 2: Convert to fraction form
    955.12/1,318.12 = 721.84/x
  3. Step 3: Cross multiply
    955.12x = 1,318.12 × 721.84
  4. Step 4: Simplify right side
    955.12x = 951,471.74
  5. Step 5: Solve for x
    x = 951,471.74/955.12
  6. Step 6: Final answer
    x = 996.18

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1.5x scale

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.