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Finding the Fourth Proportional to 257.96, 386.70 and 113.60

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Solution

The fourth proportional to 257.96, 386.70 and 113.60 is: 170.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.96 : 386.70 = 113.60 : x
  2. Step 2: Convert to fraction form
    257.96/386.70 = 113.60/x
  3. Step 3: Cross multiply
    257.96x = 386.70 × 113.60
  4. Step 4: Simplify right side
    257.96x = 43,929.12
  5. Step 5: Solve for x
    x = 43,929.12/257.96
  6. Step 6: Final answer
    x = 170.29

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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.