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Finding the Fourth Proportional to 842.19, 1,263.12 and 225.90

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Solution

The fourth proportional to 842.19, 1,263.12 and 225.90 is: 338.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.19 : 1,263.12 = 225.90 : x
  2. Step 2: Convert to fraction form
    842.19/1,263.12 = 225.90/x
  3. Step 3: Cross multiply
    842.19x = 1,263.12 × 225.90
  4. Step 4: Simplify right side
    842.19x = 285,338.81
  5. Step 5: Solve for x
    x = 285,338.81/842.19
  6. Step 6: Final answer
    x = 338.81

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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.