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Finding the Fourth Proportional to 255.40, 382.80 and 127

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Solution

The fourth proportional to 255.40, 382.80 and 127 is: 190.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.40 : 382.80 = 127 : x
  2. Step 2: Convert to fraction form
    255.40/382.80 = 127/x
  3. Step 3: Cross multiply
    255.40x = 382.80 × 127
  4. Step 4: Simplify right side
    255.40x = 48,615.60
  5. Step 5: Solve for x
    x = 48,615.60/255.40
  6. Step 6: Final answer
    x = 190.35

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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.