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Finding the Fourth Proportional to 958.42, 1,321.94 and 674.38

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Solution

The fourth proportional to 958.42, 1,321.94 and 674.38 is: 930.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.42 : 1,321.94 = 674.38 : x
  2. Step 2: Convert to fraction form
    958.42/1,321.94 = 674.38/x
  3. Step 3: Cross multiply
    958.42x = 1,321.94 × 674.38
  4. Step 4: Simplify right side
    958.42x = 891,489.90
  5. Step 5: Solve for x
    x = 891,489.90/958.42
  6. Step 6: Final answer
    x = 930.17

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Double scale
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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.