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Finding the Fourth Proportional to 842.00, 1,263.69 and 380.12

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Solution

The fourth proportional to 842.00, 1,263.69 and 380.12 is: 570.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.00 : 1,263.69 = 380.12 : x
  2. Step 2: Convert to fraction form
    842.00/1,263.69 = 380.12/x
  3. Step 3: Cross multiply
    842.00x = 1,263.69 × 380.12
  4. Step 4: Simplify right side
    842.00x = 480,347.52
  5. Step 5: Solve for x
    x = 480,347.52/842.00
  6. Step 6: Final answer
    x = 570.49

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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.