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Finding the Fourth Proportional to 1,212.11, 1,816.78 and 517.74

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Solution

The fourth proportional to 1,212.11, 1,816.78 and 517.74 is: 776.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.11 : 1,816.78 = 517.74 : x
  2. Step 2: Convert to fraction form
    1,212.11/1,816.78 = 517.74/x
  3. Step 3: Cross multiply
    1,212.11x = 1,816.78 × 517.74
  4. Step 4: Simplify right side
    1,212.11x = 940,622.76
  5. Step 5: Solve for x
    x = 940,622.76/1,212.11
  6. Step 6: Final answer
    x = 776.02

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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.