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Finding the Fourth Proportional to 1,310.81, 1,966.21 and 445.12

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Solution

The fourth proportional to 1,310.81, 1,966.21 and 445.12 is: 667.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.81 : 1,966.21 = 445.12 : x
  2. Step 2: Convert to fraction form
    1,310.81/1,966.21 = 445.12/x
  3. Step 3: Cross multiply
    1,310.81x = 1,966.21 × 445.12
  4. Step 4: Simplify right side
    1,310.81x = 875,193.37
  5. Step 5: Solve for x
    x = 875,193.37/1,310.81
  6. Step 6: Final answer
    x = 667.68

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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.