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Finding the Fourth Proportional to 115.43, 172.15 and 104.49

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Solution

The fourth proportional to 115.43, 172.15 and 104.49 is: 155.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.43 : 172.15 = 104.49 : x
  2. Step 2: Convert to fraction form
    115.43/172.15 = 104.49/x
  3. Step 3: Cross multiply
    115.43x = 172.15 × 104.49
  4. Step 4: Simplify right side
    115.43x = 17,987.99
  5. Step 5: Solve for x
    x = 17,987.99/115.43
  6. Step 6: Final answer
    x = 155.84

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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.