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Finding the Fourth Proportional to 255.69, 383.13 and 221.67

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Solution

The fourth proportional to 255.69, 383.13 and 221.67 is: 332.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.69 : 383.13 = 221.67 : x
  2. Step 2: Convert to fraction form
    255.69/383.13 = 221.67/x
  3. Step 3: Cross multiply
    255.69x = 383.13 × 221.67
  4. Step 4: Simplify right side
    255.69x = 84,928.43
  5. Step 5: Solve for x
    x = 84,928.43/255.69
  6. Step 6: Final answer
    x = 332.15

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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.