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Finding the Fourth Proportional to 814.70, 1,218.89 and 722.34

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Solution

The fourth proportional to 814.70, 1,218.89 and 722.34 is: 1,080.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.70 : 1,218.89 = 722.34 : x
  2. Step 2: Convert to fraction form
    814.70/1,218.89 = 722.34/x
  3. Step 3: Cross multiply
    814.70x = 1,218.89 × 722.34
  4. Step 4: Simplify right side
    814.70x = 880,453.00
  5. Step 5: Solve for x
    x = 880,453.00/814.70
  6. Step 6: Final answer
    x = 1,080.71

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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.