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Finding the Fourth Proportional to 172.98, 237.42 and 155.16

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Solution

The fourth proportional to 172.98, 237.42 and 155.16 is: 212.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.98 : 237.42 = 155.16 : x
  2. Step 2: Convert to fraction form
    172.98/237.42 = 155.16/x
  3. Step 3: Cross multiply
    172.98x = 237.42 × 155.16
  4. Step 4: Simplify right side
    172.98x = 36,838.09
  5. Step 5: Solve for x
    x = 36,838.09/172.98
  6. Step 6: Final answer
    x = 212.96

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.