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Finding the Fourth Proportional to 172.31, 238.01 and 156.78

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Solution

The fourth proportional to 172.31, 238.01 and 156.78 is: 216.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.31 : 238.01 = 156.78 : x
  2. Step 2: Convert to fraction form
    172.31/238.01 = 156.78/x
  3. Step 3: Cross multiply
    172.31x = 238.01 × 156.78
  4. Step 4: Simplify right side
    172.31x = 37,314.42
  5. Step 5: Solve for x
    x = 37,314.42/172.31
  6. Step 6: Final answer
    x = 216.56

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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.