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Finding the Fourth Proportional to 842.81, 1,163.13 and 469.85

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Solution

The fourth proportional to 842.81, 1,163.13 and 469.85 is: 648.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.81 : 1,163.13 = 469.85 : x
  2. Step 2: Convert to fraction form
    842.81/1,163.13 = 469.85/x
  3. Step 3: Cross multiply
    842.81x = 1,163.13 × 469.85
  4. Step 4: Simplify right side
    842.81x = 546,496.63
  5. Step 5: Solve for x
    x = 546,496.63/842.81
  6. Step 6: Final answer
    x = 648.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.