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Finding the Fourth Proportional to 958.68, 1,321.39 and 678.56

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Solution

The fourth proportional to 958.68, 1,321.39 and 678.56 is: 935.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.68 : 1,321.39 = 678.56 : x
  2. Step 2: Convert to fraction form
    958.68/1,321.39 = 678.56/x
  3. Step 3: Cross multiply
    958.68x = 1,321.39 × 678.56
  4. Step 4: Simplify right side
    958.68x = 896,639.50
  5. Step 5: Solve for x
    x = 896,639.50/958.68
  6. Step 6: Final answer
    x = 935.28

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Half scale
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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.