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Finding the Fourth Proportional to 912.13, 1,367.98 and 443.58

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Solution

The fourth proportional to 912.13, 1,367.98 and 443.58 is: 665.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.13 : 1,367.98 = 443.58 : x
  2. Step 2: Convert to fraction form
    912.13/1,367.98 = 443.58/x
  3. Step 3: Cross multiply
    912.13x = 1,367.98 × 443.58
  4. Step 4: Simplify right side
    912.13x = 606,815.12
  5. Step 5: Solve for x
    x = 606,815.12/912.13
  6. Step 6: Final answer
    x = 665.27

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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.