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Finding the Fourth Proportional to 842.42, 1,263.63 and 380.12

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Solution

The fourth proportional to 842.42, 1,263.63 and 380.12 is: 570.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.42 : 1,263.63 = 380.12 : x
  2. Step 2: Convert to fraction form
    842.42/1,263.63 = 380.12/x
  3. Step 3: Cross multiply
    842.42x = 1,263.63 × 380.12
  4. Step 4: Simplify right side
    842.42x = 480,324.72
  5. Step 5: Solve for x
    x = 480,324.72/842.42
  6. Step 6: Final answer
    x = 570.18

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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.