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Finding the Fourth Proportional to 257.22, 385.56 and 111.04

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Solution

The fourth proportional to 257.22, 385.56 and 111.04 is: 166.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.22 : 385.56 = 111.04 : x
  2. Step 2: Convert to fraction form
    257.22/385.56 = 111.04/x
  3. Step 3: Cross multiply
    257.22x = 385.56 × 111.04
  4. Step 4: Simplify right side
    257.22x = 42,812.58
  5. Step 5: Solve for x
    x = 42,812.58/257.22
  6. Step 6: Final answer
    x = 166.44

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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.