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Finding the Fourth Proportional to 257.07, 385.34 and 120

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Solution

The fourth proportional to 257.07, 385.34 and 120 is: 179.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.07 : 385.34 = 120 : x
  2. Step 2: Convert to fraction form
    257.07/385.34 = 120/x
  3. Step 3: Cross multiply
    257.07x = 385.34 × 120
  4. Step 4: Simplify right side
    257.07x = 46,240.20
  5. Step 5: Solve for x
    x = 46,240.20/257.07
  6. Step 6: Final answer
    x = 179.87

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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.