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Finding the Fourth Proportional to 256.69, 384.99 and 119.80

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Solution

The fourth proportional to 256.69, 384.99 and 119.80 is: 179.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.69 : 384.99 = 119.80 : x
  2. Step 2: Convert to fraction form
    256.69/384.99 = 119.80/x
  3. Step 3: Cross multiply
    256.69x = 384.99 × 119.80
  4. Step 4: Simplify right side
    256.69x = 46,121.83
  5. Step 5: Solve for x
    x = 46,121.83/256.69
  6. Step 6: Final answer
    x = 179.68

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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.