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Finding the Fourth Proportional to 255.86, 383.92 and 111.56

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Solution

The fourth proportional to 255.86, 383.92 and 111.56 is: 167.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.86 : 383.92 = 111.56 : x
  2. Step 2: Convert to fraction form
    255.86/383.92 = 111.56/x
  3. Step 3: Cross multiply
    255.86x = 383.92 × 111.56
  4. Step 4: Simplify right side
    255.86x = 42,830.80
  5. Step 5: Solve for x
    x = 42,830.80/255.86
  6. Step 6: Final answer
    x = 167.40

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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.