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Finding the Fourth Proportional to 255.78, 383.37 and 118.70

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Solution

The fourth proportional to 255.78, 383.37 and 118.70 is: 177.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.78 : 383.37 = 118.70 : x
  2. Step 2: Convert to fraction form
    255.78/383.37 = 118.70/x
  3. Step 3: Cross multiply
    255.78x = 383.37 × 118.70
  4. Step 4: Simplify right side
    255.78x = 45,506.02
  5. Step 5: Solve for x
    x = 45,506.02/255.78
  6. Step 6: Final answer
    x = 177.91

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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.