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Finding the Fourth Proportional to 255.05, 382.65 and 72.45

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Solution

The fourth proportional to 255.05, 382.65 and 72.45 is: 108.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.05 : 382.65 = 72.45 : x
  2. Step 2: Convert to fraction form
    255.05/382.65 = 72.45/x
  3. Step 3: Cross multiply
    255.05x = 382.65 × 72.45
  4. Step 4: Simplify right side
    255.05x = 27,722.72
  5. Step 5: Solve for x
    x = 27,722.72/255.05
  6. Step 6: Final answer
    x = 108.70

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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.