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Finding the Fourth Proportional to 958.02, 1,321.95 and 538.38

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Solution

The fourth proportional to 958.02, 1,321.95 and 538.38 is: 742.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.02 : 1,321.95 = 538.38 : x
  2. Step 2: Convert to fraction form
    958.02/1,321.95 = 538.38/x
  3. Step 3: Cross multiply
    958.02x = 1,321.95 × 538.38
  4. Step 4: Simplify right side
    958.02x = 711,711.44
  5. Step 5: Solve for x
    x = 711,711.44/958.02
  6. Step 6: Final answer
    x = 742.90

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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.