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Finding the Fourth Proportional to 129.90, 195.74 and 107.57

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Solution

The fourth proportional to 129.90, 195.74 and 107.57 is: 162.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.90 : 195.74 = 107.57 : x
  2. Step 2: Convert to fraction form
    129.90/195.74 = 107.57/x
  3. Step 3: Cross multiply
    129.90x = 195.74 × 107.57
  4. Step 4: Simplify right side
    129.90x = 21,056.51
  5. Step 5: Solve for x
    x = 21,056.51/129.90
  6. Step 6: Final answer
    x = 162.10

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.