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Finding the Fourth Proportional to 239.16, 329.64 and 172.68

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Solution

The fourth proportional to 239.16, 329.64 and 172.68 is: 238.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.16 : 329.64 = 172.68 : x
  2. Step 2: Convert to fraction form
    239.16/329.64 = 172.68/x
  3. Step 3: Cross multiply
    239.16x = 329.64 × 172.68
  4. Step 4: Simplify right side
    239.16x = 56,922.24
  5. Step 5: Solve for x
    x = 56,922.24/239.16
  6. Step 6: Final answer
    x = 238.01

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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.