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Finding the Fourth Proportional to 238.36, 328.96 and 172.90

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Solution

The fourth proportional to 238.36, 328.96 and 172.90 is: 238.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.36 : 328.96 = 172.90 : x
  2. Step 2: Convert to fraction form
    238.36/328.96 = 172.90/x
  3. Step 3: Cross multiply
    238.36x = 328.96 × 172.90
  4. Step 4: Simplify right side
    238.36x = 56,877.81
  5. Step 5: Solve for x
    x = 56,877.81/238.36
  6. Step 6: Final answer
    x = 238.62

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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.