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Finding the Fourth Proportional to 257.39, 354.86 and 187.39

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Solution

The fourth proportional to 257.39, 354.86 and 187.39 is: 258.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.39 : 354.86 = 187.39 : x
  2. Step 2: Convert to fraction form
    257.39/354.86 = 187.39/x
  3. Step 3: Cross multiply
    257.39x = 354.86 × 187.39
  4. Step 4: Simplify right side
    257.39x = 66,494.50
  5. Step 5: Solve for x
    x = 66,494.50/257.39
  6. Step 6: Final answer
    x = 258.34

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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.