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Finding the Fourth Proportional to 349.09, 523.87 and 129.72

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Solution

The fourth proportional to 349.09, 523.87 and 129.72 is: 194.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.09 : 523.87 = 129.72 : x
  2. Step 2: Convert to fraction form
    349.09/523.87 = 129.72/x
  3. Step 3: Cross multiply
    349.09x = 523.87 × 129.72
  4. Step 4: Simplify right side
    349.09x = 67,955.11
  5. Step 5: Solve for x
    x = 67,955.11/349.09
  6. Step 6: Final answer
    x = 194.66

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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.