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Finding the Fourth Proportional to 172.99, 260.36 and 129.89

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Solution

The fourth proportional to 172.99, 260.36 and 129.89 is: 195.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.99 : 260.36 = 129.89 : x
  2. Step 2: Convert to fraction form
    172.99/260.36 = 129.89/x
  3. Step 3: Cross multiply
    172.99x = 260.36 × 129.89
  4. Step 4: Simplify right side
    172.99x = 33,816.21
  5. Step 5: Solve for x
    x = 33,816.21/172.99
  6. Step 6: Final answer
    x = 195.49

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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.