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Finding the Fourth Proportional to 1,412.82, 2,119.49 and 438.69

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Solution

The fourth proportional to 1,412.82, 2,119.49 and 438.69 is: 658.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.82 : 2,119.49 = 438.69 : x
  2. Step 2: Convert to fraction form
    1,412.82/2,119.49 = 438.69/x
  3. Step 3: Cross multiply
    1,412.82x = 2,119.49 × 438.69
  4. Step 4: Simplify right side
    1,412.82x = 929,796.87
  5. Step 5: Solve for x
    x = 929,796.87/1,412.82
  6. Step 6: Final answer
    x = 658.11

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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.