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Finding the Fourth Proportional to 843.40, 1,262.70 and 747.40

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Solution

The fourth proportional to 843.40, 1,262.70 and 747.40 is: 1,118.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.40 : 1,262.70 = 747.40 : x
  2. Step 2: Convert to fraction form
    843.40/1,262.70 = 747.40/x
  3. Step 3: Cross multiply
    843.40x = 1,262.70 × 747.40
  4. Step 4: Simplify right side
    843.40x = 943,741.98
  5. Step 5: Solve for x
    x = 943,741.98/843.40
  6. Step 6: Final answer
    x = 1,118.97

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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.