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Finding the Fourth Proportional to 238.32, 355.36 and 209.54

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Solution

The fourth proportional to 238.32, 355.36 and 209.54 is: 312.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.32 : 355.36 = 209.54 : x
  2. Step 2: Convert to fraction form
    238.32/355.36 = 209.54/x
  3. Step 3: Cross multiply
    238.32x = 355.36 × 209.54
  4. Step 4: Simplify right side
    238.32x = 74,462.13
  5. Step 5: Solve for x
    x = 74,462.13/238.32
  6. Step 6: Final answer
    x = 312.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.