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Finding the Fourth Proportional to 277.40, 415.83 and 212.20

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Solution

The fourth proportional to 277.40, 415.83 and 212.20 is: 318.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.40 : 415.83 = 212.20 : x
  2. Step 2: Convert to fraction form
    277.40/415.83 = 212.20/x
  3. Step 3: Cross multiply
    277.40x = 415.83 × 212.20
  4. Step 4: Simplify right side
    277.40x = 88,239.13
  5. Step 5: Solve for x
    x = 88,239.13/277.40
  6. Step 6: Final answer
    x = 318.09

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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.