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Finding the Fourth Proportional to 814.69, 1,223.25 and 790.39

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Solution

The fourth proportional to 814.69, 1,223.25 and 790.39 is: 1,186.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.69 : 1,223.25 = 790.39 : x
  2. Step 2: Convert to fraction form
    814.69/1,223.25 = 790.39/x
  3. Step 3: Cross multiply
    814.69x = 1,223.25 × 790.39
  4. Step 4: Simplify right side
    814.69x = 966,844.57
  5. Step 5: Solve for x
    x = 966,844.57/814.69
  6. Step 6: Final answer
    x = 1,186.76

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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.