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Finding the Fourth Proportional to 842.58, 1,261.92 and 813.39

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Solution

The fourth proportional to 842.58, 1,261.92 and 813.39 is: 1,218.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.58 : 1,261.92 = 813.39 : x
  2. Step 2: Convert to fraction form
    842.58/1,261.92 = 813.39/x
  3. Step 3: Cross multiply
    842.58x = 1,261.92 × 813.39
  4. Step 4: Simplify right side
    842.58x = 1,026,433.11
  5. Step 5: Solve for x
    x = 1,026,433.11/842.58
  6. Step 6: Final answer
    x = 1,218.20

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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.