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Finding the Fourth Proportional to 842.90, 1,163.17 and 469.87

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Solution

The fourth proportional to 842.90, 1,163.17 and 469.87 is: 648.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.90 : 1,163.17 = 469.87 : x
  2. Step 2: Convert to fraction form
    842.90/1,163.17 = 469.87/x
  3. Step 3: Cross multiply
    842.90x = 1,163.17 × 469.87
  4. Step 4: Simplify right side
    842.90x = 546,536.37
  5. Step 5: Solve for x
    x = 546,536.37/842.90
  6. Step 6: Final answer
    x = 648.40

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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.