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Finding the Fourth Proportional to 172.85, 258.66 and 138.83

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Solution

The fourth proportional to 172.85, 258.66 and 138.83 is: 207.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.85 : 258.66 = 138.83 : x
  2. Step 2: Convert to fraction form
    172.85/258.66 = 138.83/x
  3. Step 3: Cross multiply
    172.85x = 258.66 × 138.83
  4. Step 4: Simplify right side
    172.85x = 35,909.77
  5. Step 5: Solve for x
    x = 35,909.77/172.85
  6. Step 6: Final answer
    x = 207.75

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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.