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Finding the Fourth Proportional to 257.86, 386.82 and 95.50

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Solution

The fourth proportional to 257.86, 386.82 and 95.50 is: 143.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.86 : 386.82 = 95.50 : x
  2. Step 2: Convert to fraction form
    257.86/386.82 = 95.50/x
  3. Step 3: Cross multiply
    257.86x = 386.82 × 95.50
  4. Step 4: Simplify right side
    257.86x = 36,940.34
  5. Step 5: Solve for x
    x = 36,940.34/257.86
  6. Step 6: Final answer
    x = 143.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.