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Finding the Fourth Proportional to 958.92, 1,438.76 and 411.20

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Solution

The fourth proportional to 958.92, 1,438.76 and 411.20 is: 616.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.92 : 1,438.76 = 411.20 : x
  2. Step 2: Convert to fraction form
    958.92/1,438.76 = 411.20/x
  3. Step 3: Cross multiply
    958.92x = 1,438.76 × 411.20
  4. Step 4: Simplify right side
    958.92x = 591,618.11
  5. Step 5: Solve for x
    x = 591,618.11/958.92
  6. Step 6: Final answer
    x = 616.96

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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.