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Finding the Fourth Proportional to 255.95, 383.85 and 111.63

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Solution

The fourth proportional to 255.95, 383.85 and 111.63 is: 167.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.95 : 383.85 = 111.63 : x
  2. Step 2: Convert to fraction form
    255.95/383.85 = 111.63/x
  3. Step 3: Cross multiply
    255.95x = 383.85 × 111.63
  4. Step 4: Simplify right side
    255.95x = 42,849.18
  5. Step 5: Solve for x
    x = 42,849.18/255.95
  6. Step 6: Final answer
    x = 167.42

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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.