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Finding the Fourth Proportional to 277.90, 416.78 and 115.55

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Solution

The fourth proportional to 277.90, 416.78 and 115.55 is: 173.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.90 : 416.78 = 115.55 : x
  2. Step 2: Convert to fraction form
    277.90/416.78 = 115.55/x
  3. Step 3: Cross multiply
    277.90x = 416.78 × 115.55
  4. Step 4: Simplify right side
    277.90x = 48,157.83
  5. Step 5: Solve for x
    x = 48,157.83/277.90
  6. Step 6: Final answer
    x = 173.29

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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.