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Finding the Fourth Proportional to 129.51, 194.31 and 57.42

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Solution

The fourth proportional to 129.51, 194.31 and 57.42 is: 86.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.51 : 194.31 = 57.42 : x
  2. Step 2: Convert to fraction form
    129.51/194.31 = 57.42/x
  3. Step 3: Cross multiply
    129.51x = 194.31 × 57.42
  4. Step 4: Simplify right side
    129.51x = 11,157.28
  5. Step 5: Solve for x
    x = 11,157.28/129.51
  6. Step 6: Final answer
    x = 86.15

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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.