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Finding the Fourth Proportional to 1,214.56, 1,821.78 and 445

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Solution

The fourth proportional to 1,214.56, 1,821.78 and 445 is: 667.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.56 : 1,821.78 = 445 : x
  2. Step 2: Convert to fraction form
    1,214.56/1,821.78 = 445/x
  3. Step 3: Cross multiply
    1,214.56x = 1,821.78 × 445
  4. Step 4: Simplify right side
    1,214.56x = 810,692.10
  5. Step 5: Solve for x
    x = 810,692.10/1,214.56
  6. Step 6: Final answer
    x = 667.48

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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.