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Finding the Fourth Proportional to 842.70, 1,262.40 and 553.26

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Solution

The fourth proportional to 842.70, 1,262.40 and 553.26 is: 828.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.70 : 1,262.40 = 553.26 : x
  2. Step 2: Convert to fraction form
    842.70/1,262.40 = 553.26/x
  3. Step 3: Cross multiply
    842.70x = 1,262.40 × 553.26
  4. Step 4: Simplify right side
    842.70x = 698,435.42
  5. Step 5: Solve for x
    x = 698,435.42/842.70
  6. Step 6: Final answer
    x = 828.81

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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.