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Finding the Fourth Proportional to 277.20, 415.86 and 140.22

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Solution

The fourth proportional to 277.20, 415.86 and 140.22 is: 210.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.20 : 415.86 = 140.22 : x
  2. Step 2: Convert to fraction form
    277.20/415.86 = 140.22/x
  3. Step 3: Cross multiply
    277.20x = 415.86 × 140.22
  4. Step 4: Simplify right side
    277.20x = 58,311.89
  5. Step 5: Solve for x
    x = 58,311.89/277.20
  6. Step 6: Final answer
    x = 210.36

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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.