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Finding the Fourth Proportional to 842.91, 1,163.13 and 469.80

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Solution

The fourth proportional to 842.91, 1,163.13 and 469.80 is: 648.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.91 : 1,163.13 = 469.80 : x
  2. Step 2: Convert to fraction form
    842.91/1,163.13 = 469.80/x
  3. Step 3: Cross multiply
    842.91x = 1,163.13 × 469.80
  4. Step 4: Simplify right side
    842.91x = 546,438.47
  5. Step 5: Solve for x
    x = 546,438.47/842.91
  6. Step 6: Final answer
    x = 648.28

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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.