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Finding the Fourth Proportional to 842.38, 1,262.96 and 720.88

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Solution

The fourth proportional to 842.38, 1,262.96 and 720.88 is: 1,080.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.38 : 1,262.96 = 720.88 : x
  2. Step 2: Convert to fraction form
    842.38/1,262.96 = 720.88/x
  3. Step 3: Cross multiply
    842.38x = 1,262.96 × 720.88
  4. Step 4: Simplify right side
    842.38x = 910,442.60
  5. Step 5: Solve for x
    x = 910,442.60/842.38
  6. Step 6: Final answer
    x = 1,080.80

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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.