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Finding the Fourth Proportional to 255.54, 385.45 and 255.54

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Solution

The fourth proportional to 255.54, 385.45 and 255.54 is: 385.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.54 : 385.45 = 255.54 : x
  2. Step 2: Convert to fraction form
    255.54/385.45 = 255.54/x
  3. Step 3: Cross multiply
    255.54x = 385.45 × 255.54
  4. Step 4: Simplify right side
    255.54x = 98,497.89
  5. Step 5: Solve for x
    x = 98,497.89/255.54
  6. Step 6: Final answer
    x = 385.45

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.