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Finding the Fourth Proportional to 172.71, 238.64 and 139.91

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Solution

The fourth proportional to 172.71, 238.64 and 139.91 is: 193.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.71 : 238.64 = 139.91 : x
  2. Step 2: Convert to fraction form
    172.71/238.64 = 139.91/x
  3. Step 3: Cross multiply
    172.71x = 238.64 × 139.91
  4. Step 4: Simplify right side
    172.71x = 33,388.12
  5. Step 5: Solve for x
    x = 33,388.12/172.71
  6. Step 6: Final answer
    x = 193.32

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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.