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Finding the Fourth Proportional to 172.48, 238.08 and 151.78

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Solution

The fourth proportional to 172.48, 238.08 and 151.78 is: 209.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.48 : 238.08 = 151.78 : x
  2. Step 2: Convert to fraction form
    172.48/238.08 = 151.78/x
  3. Step 3: Cross multiply
    172.48x = 238.08 × 151.78
  4. Step 4: Simplify right side
    172.48x = 36,135.78
  5. Step 5: Solve for x
    x = 36,135.78/172.48
  6. Step 6: Final answer
    x = 209.51

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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.