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Finding the Fourth Proportional to 255.12, 382.71 and 81.80

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Solution

The fourth proportional to 255.12, 382.71 and 81.80 is: 122.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.12 : 382.71 = 81.80 : x
  2. Step 2: Convert to fraction form
    255.12/382.71 = 81.80/x
  3. Step 3: Cross multiply
    255.12x = 382.71 × 81.80
  4. Step 4: Simplify right side
    255.12x = 31,303.76
  5. Step 5: Solve for x
    x = 31,303.76/255.12
  6. Step 6: Final answer
    x = 122.70

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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.