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Finding the Fourth Proportional to 1,412.82, 2,119.46 and 438.72

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Solution

The fourth proportional to 1,412.82, 2,119.46 and 438.72 is: 658.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.82 : 2,119.46 = 438.72 : x
  2. Step 2: Convert to fraction form
    1,412.82/2,119.46 = 438.72/x
  3. Step 3: Cross multiply
    1,412.82x = 2,119.46 × 438.72
  4. Step 4: Simplify right side
    1,412.82x = 929,847.30
  5. Step 5: Solve for x
    x = 929,847.30/1,412.82
  6. Step 6: Final answer
    x = 658.15

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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.