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Finding the Fourth Proportional to 257.99, 386.90 and 111.57

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Solution

The fourth proportional to 257.99, 386.90 and 111.57 is: 167.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.99 : 386.90 = 111.57 : x
  2. Step 2: Convert to fraction form
    257.99/386.90 = 111.57/x
  3. Step 3: Cross multiply
    257.99x = 386.90 × 111.57
  4. Step 4: Simplify right side
    257.99x = 43,165.88
  5. Step 5: Solve for x
    x = 43,165.88/257.99
  6. Step 6: Final answer
    x = 167.32

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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.