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Finding the Fourth Proportional to 115.94, 172.95 and 103.79

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Solution

The fourth proportional to 115.94, 172.95 and 103.79 is: 154.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.94 : 172.95 = 103.79 : x
  2. Step 2: Convert to fraction form
    115.94/172.95 = 103.79/x
  3. Step 3: Cross multiply
    115.94x = 172.95 × 103.79
  4. Step 4: Simplify right side
    115.94x = 17,950.48
  5. Step 5: Solve for x
    x = 17,950.48/115.94
  6. Step 6: Final answer
    x = 154.83

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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.