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Finding the Fourth Proportional to 172.86, 239.11 and 145.19

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Solution

The fourth proportional to 172.86, 239.11 and 145.19 is: 200.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.86 : 239.11 = 145.19 : x
  2. Step 2: Convert to fraction form
    172.86/239.11 = 145.19/x
  3. Step 3: Cross multiply
    172.86x = 239.11 × 145.19
  4. Step 4: Simplify right side
    172.86x = 34,715.72
  5. Step 5: Solve for x
    x = 34,715.72/172.86
  6. Step 6: Final answer
    x = 200.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.