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Finding the Fourth Proportional to 1,321.76, 1,979.40 and 958.88

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Solution

The fourth proportional to 1,321.76, 1,979.40 and 958.88 is: 1,435.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.76 : 1,979.40 = 958.88 : x
  2. Step 2: Convert to fraction form
    1,321.76/1,979.40 = 958.88/x
  3. Step 3: Cross multiply
    1,321.76x = 1,979.40 × 958.88
  4. Step 4: Simplify right side
    1,321.76x = 1,898,007.07
  5. Step 5: Solve for x
    x = 1,898,007.07/1,321.76
  6. Step 6: Final answer
    x = 1,435.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.