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Finding the Fourth Proportional to 115.73, 172.77 and 98.43

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Solution

The fourth proportional to 115.73, 172.77 and 98.43 is: 146.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.73 : 172.77 = 98.43 : x
  2. Step 2: Convert to fraction form
    115.73/172.77 = 98.43/x
  3. Step 3: Cross multiply
    115.73x = 172.77 × 98.43
  4. Step 4: Simplify right side
    115.73x = 17,005.75
  5. Step 5: Solve for x
    x = 17,005.75/115.73
  6. Step 6: Final answer
    x = 146.95

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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.