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Finding the Fourth Proportional to 1,206.45, 1,664.25 and 812.79

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Solution

The fourth proportional to 1,206.45, 1,664.25 and 812.79 is: 1,121.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.45 : 1,664.25 = 812.79 : x
  2. Step 2: Convert to fraction form
    1,206.45/1,664.25 = 812.79/x
  3. Step 3: Cross multiply
    1,206.45x = 1,664.25 × 812.79
  4. Step 4: Simplify right side
    1,206.45x = 1,352,685.76
  5. Step 5: Solve for x
    x = 1,352,685.76/1,206.45
  6. Step 6: Final answer
    x = 1,121.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.