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Finding the Fourth Proportional to 172.04, 257.95 and 80.79

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Solution

The fourth proportional to 172.04, 257.95 and 80.79 is: 121.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.04 : 257.95 = 80.79 : x
  2. Step 2: Convert to fraction form
    172.04/257.95 = 80.79/x
  3. Step 3: Cross multiply
    172.04x = 257.95 × 80.79
  4. Step 4: Simplify right side
    172.04x = 20,839.58
  5. Step 5: Solve for x
    x = 20,839.58/172.04
  6. Step 6: Final answer
    x = 121.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.