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Finding the Fourth Proportional to 172.42, 237.77 and 117.21

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Solution

The fourth proportional to 172.42, 237.77 and 117.21 is: 161.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.42 : 237.77 = 117.21 : x
  2. Step 2: Convert to fraction form
    172.42/237.77 = 117.21/x
  3. Step 3: Cross multiply
    172.42x = 237.77 × 117.21
  4. Step 4: Simplify right side
    172.42x = 27,869.02
  5. Step 5: Solve for x
    x = 27,869.02/172.42
  6. Step 6: Final answer
    x = 161.63

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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.