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Finding the Fourth Proportional to 277.35, 415.79 and 140.21

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Solution

The fourth proportional to 277.35, 415.79 and 140.21 is: 210.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.35 : 415.79 = 140.21 : x
  2. Step 2: Convert to fraction form
    277.35/415.79 = 140.21/x
  3. Step 3: Cross multiply
    277.35x = 415.79 × 140.21
  4. Step 4: Simplify right side
    277.35x = 58,295.14
  5. Step 5: Solve for x
    x = 58,295.14/277.35
  6. Step 6: Final answer
    x = 210.19

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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.