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Finding the Fourth Proportional to 817.18, 1,220.59 and 769.79

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Solution

The fourth proportional to 817.18, 1,220.59 and 769.79 is: 1,149.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.18 : 1,220.59 = 769.79 : x
  2. Step 2: Convert to fraction form
    817.18/1,220.59 = 769.79/x
  3. Step 3: Cross multiply
    817.18x = 1,220.59 × 769.79
  4. Step 4: Simplify right side
    817.18x = 939,597.98
  5. Step 5: Solve for x
    x = 939,597.98/817.18
  6. Step 6: Final answer
    x = 1,149.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.