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Finding the Fourth Proportional to 129.00, 193.12 and 115.81

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Solution

The fourth proportional to 129.00, 193.12 and 115.81 is: 173.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.00 : 193.12 = 115.81 : x
  2. Step 2: Convert to fraction form
    129.00/193.12 = 115.81/x
  3. Step 3: Cross multiply
    129.00x = 193.12 × 115.81
  4. Step 4: Simplify right side
    129.00x = 22,364.26
  5. Step 5: Solve for x
    x = 22,364.26/129.00
  6. Step 6: Final answer
    x = 173.36

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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.