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Finding the Fourth Proportional to 958.94, 1,321.93 and 678.31

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Solution

The fourth proportional to 958.94, 1,321.93 and 678.31 is: 935.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.94 : 1,321.93 = 678.31 : x
  2. Step 2: Convert to fraction form
    958.94/1,321.93 = 678.31/x
  3. Step 3: Cross multiply
    958.94x = 1,321.93 × 678.31
  4. Step 4: Simplify right side
    958.94x = 896,680.84
  5. Step 5: Solve for x
    x = 896,680.84/958.94
  6. Step 6: Final answer
    x = 935.07

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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.