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Finding the Fourth Proportional to 257.86, 355.16 and 238.39

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Solution

The fourth proportional to 257.86, 355.16 and 238.39 is: 328.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.86 : 355.16 = 238.39 : x
  2. Step 2: Convert to fraction form
    257.86/355.16 = 238.39/x
  3. Step 3: Cross multiply
    257.86x = 355.16 × 238.39
  4. Step 4: Simplify right side
    257.86x = 84,666.30
  5. Step 5: Solve for x
    x = 84,666.30/257.86
  6. Step 6: Final answer
    x = 328.34

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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.