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Finding the Fourth Proportional to 1,212.15, 1,817.01 and 389.82

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Solution

The fourth proportional to 1,212.15, 1,817.01 and 389.82 is: 584.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.15 : 1,817.01 = 389.82 : x
  2. Step 2: Convert to fraction form
    1,212.15/1,817.01 = 389.82/x
  3. Step 3: Cross multiply
    1,212.15x = 1,817.01 × 389.82
  4. Step 4: Simplify right side
    1,212.15x = 708,306.84
  5. Step 5: Solve for x
    x = 708,306.84/1,212.15
  6. Step 6: Final answer
    x = 584.34

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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.