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Finding the Fourth Proportional to 958.96, 1,431.54 and 813.20

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Solution

The fourth proportional to 958.96, 1,431.54 and 813.20 is: 1,213.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.96 : 1,431.54 = 813.20 : x
  2. Step 2: Convert to fraction form
    958.96/1,431.54 = 813.20/x
  3. Step 3: Cross multiply
    958.96x = 1,431.54 × 813.20
  4. Step 4: Simplify right side
    958.96x = 1,164,128.33
  5. Step 5: Solve for x
    x = 1,164,128.33/958.96
  6. Step 6: Final answer
    x = 1,213.95

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.