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Finding the Fourth Proportional to 257.09, 385.47 and 92.48

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Solution

The fourth proportional to 257.09, 385.47 and 92.48 is: 138.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.09 : 385.47 = 92.48 : x
  2. Step 2: Convert to fraction form
    257.09/385.47 = 92.48/x
  3. Step 3: Cross multiply
    257.09x = 385.47 × 92.48
  4. Step 4: Simplify right side
    257.09x = 35,646.34
  5. Step 5: Solve for x
    x = 35,646.34/257.09
  6. Step 6: Final answer
    x = 138.66

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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.