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Finding the Fourth Proportional to 129.40, 193.36 and 112.93

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Solution

The fourth proportional to 129.40, 193.36 and 112.93 is: 168.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.40 : 193.36 = 112.93 : x
  2. Step 2: Convert to fraction form
    129.40/193.36 = 112.93/x
  3. Step 3: Cross multiply
    129.40x = 193.36 × 112.93
  4. Step 4: Simplify right side
    129.40x = 21,836.14
  5. Step 5: Solve for x
    x = 21,836.14/129.40
  6. Step 6: Final answer
    x = 168.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.