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Finding the Fourth Proportional to 255.86, 383.72 and 73.21

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Solution

The fourth proportional to 255.86, 383.72 and 73.21 is: 109.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.86 : 383.72 = 73.21 : x
  2. Step 2: Convert to fraction form
    255.86/383.72 = 73.21/x
  3. Step 3: Cross multiply
    255.86x = 383.72 × 73.21
  4. Step 4: Simplify right side
    255.86x = 28,091.36
  5. Step 5: Solve for x
    x = 28,091.36/255.86
  6. Step 6: Final answer
    x = 109.79

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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.