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Finding the Fourth Proportional to 129.39, 194.08 and 71.64

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Solution

The fourth proportional to 129.39, 194.08 and 71.64 is: 107.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.39 : 194.08 = 71.64 : x
  2. Step 2: Convert to fraction form
    129.39/194.08 = 71.64/x
  3. Step 3: Cross multiply
    129.39x = 194.08 × 71.64
  4. Step 4: Simplify right side
    129.39x = 13,903.71
  5. Step 5: Solve for x
    x = 13,903.71/129.39
  6. Step 6: Final answer
    x = 107.46

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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.