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Finding the Fourth Proportional to 958.91, 1,438.18 and 342.61

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Solution

The fourth proportional to 958.91, 1,438.18 and 342.61 is: 513.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.91 : 1,438.18 = 342.61 : x
  2. Step 2: Convert to fraction form
    958.91/1,438.18 = 342.61/x
  3. Step 3: Cross multiply
    958.91x = 1,438.18 × 342.61
  4. Step 4: Simplify right side
    958.91x = 492,730.40
  5. Step 5: Solve for x
    x = 492,730.40/958.91
  6. Step 6: Final answer
    x = 513.85

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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.