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Finding the Fourth Proportional to 255.09, 382.59 and 72.45

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Solution

The fourth proportional to 255.09, 382.59 and 72.45 is: 108.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.09 : 382.59 = 72.45 : x
  2. Step 2: Convert to fraction form
    255.09/382.59 = 72.45/x
  3. Step 3: Cross multiply
    255.09x = 382.59 × 72.45
  4. Step 4: Simplify right side
    255.09x = 27,718.65
  5. Step 5: Solve for x
    x = 27,718.65/255.09
  6. Step 6: Final answer
    x = 108.66

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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.