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Finding the Fourth Proportional to 253.21, 379.57 and 129.81

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Solution

The fourth proportional to 253.21, 379.57 and 129.81 is: 194.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.21 : 379.57 = 129.81 : x
  2. Step 2: Convert to fraction form
    253.21/379.57 = 129.81/x
  3. Step 3: Cross multiply
    253.21x = 379.57 × 129.81
  4. Step 4: Simplify right side
    253.21x = 49,271.66
  5. Step 5: Solve for x
    x = 49,271.66/253.21
  6. Step 6: Final answer
    x = 194.59

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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.