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Finding the Fourth Proportional to 255.70, 383.68 and 111.38

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Solution

The fourth proportional to 255.70, 383.68 and 111.38 is: 167.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.70 : 383.68 = 111.38 : x
  2. Step 2: Convert to fraction form
    255.70/383.68 = 111.38/x
  3. Step 3: Cross multiply
    255.70x = 383.68 × 111.38
  4. Step 4: Simplify right side
    255.70x = 42,734.28
  5. Step 5: Solve for x
    x = 42,734.28/255.70
  6. Step 6: Final answer
    x = 167.13

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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.